The As denomination
The As was a bronze, and later copper, coin used during the Roman Republic and Roman Empire.

During the Republic, the as featured the bust of Janus on the obverse, and the prow of a galley on the reverse.

Following the coinage reform of Augustus in 23 BC, the as was struck in reddish pure copper instead of bronze.

The as continued to be produced until the 3rd century AD. It was the lowest valued coin regularly issued during the Roman Empire.

The last as seems to have been produced by Aurelian between 270 and 275, and at the beginning of the reign of Diocletian.
As

(1) Agrippa 37-41 A.D.
Obverse: M AGRIPPA LF COS III, head left wearing rostral crown
Reverse: S-C, Neptune standing facing, head left, naked except for cloak draped behind him & over both arms, holding small dolphin in right hand & vertical trident in left.
Ref: None provided
(2) Agrippa 38 AD
Obverse: head wearing rostrate crown left; M•AGRIPPA•L_•F • COS III
Reverse: Neptune standing left, holding dolphin and trident; S__C
Ref: RIC I Gaius 58; BMCRE II Tiberius 1...
(3) Agrippa 37-41 AD
Obverse: M AGRIPPA L F COS III, Bare head of Agrippa facing left
Reverse: Neptune standing facing left, nude except for draped cloak, holding small dolphin in right hand and trident in left; SC in fields
Ref: RIC 58
(4) Antoninus Pius 140-144 A.D.
Obverse: ANTONINVS AVG PIVS P P, laureate head right.
Reverse: TR POT COS IIII VICT AVG SC, Victory in quadriga right.
Ref: RIC 836
(5) Antoninus Pius 143-144 AD
Obverse: laureate head right; ANTONINVS AVG PI_VS P P TR P COS III
Reverse: Victory advancing right, holding wreath and palm; IMPERA_TOR II / S__C
Ref: RIC 731b; Cohen 441
(6) Augustus 7 BC
Obverse: CAESAR AVGVST PONT MAX TRIBVNIC POT, Bare head left.
Reverse: P LVRIVS AGRIPPA IIIVIR AAAFF. , Large S C
Ref: RIC 427
(7) Augustus 15-16 AD
Obverse: ·DIVVS·AVGVSTVS·PATER, Head of Augustus facing left, wearing crown; star above; thunderbolt in left field
Reverse: Seated female figure, wearing drapery, facing right, feet on stool, holding patera and long scepter; SC in fields
Ref: RIC I (2nd Ed.) Tiberius 73
(8) Augustus 7/5 BC
Obverse: CAESAR AVGVST PONT MAX TRIBVNIC POT, Bare head of Augustus facing right
Reverse: M SALVIVS OTHO IIIVIR A A A F F, Inscription surrounding large SC
Ref: RIC I (2nd Ed.) Augustus 431
(9) Augustus 7/5 BC
Obverse: CAESAR AVGVST PONT MAX TRIBVNIC POT, Bare head of Augustus facing right
Reverse: P LVRIVS AGRIPPA IIIVIR AAAFF, Inscription surrounding large SC
Ref: RIC I (2nd Ed.) Augustus 427
(10) Augustus 22/23-30AD
Obverse: DIVVS AVGVSTVS PATER, Head of Augustus facing left, wearing crown
Reverse: Altar-enclosure with double panelled door; uncertain ornaments at top; SC in fields; PROVIDENT in exergue
Ref: RIC I (2nd Ed.) Tiberius 81
(11) Augustus 11-12 AD
Obverse: IMP·CAESAR·DIVI·F·AVGVSTVS·IMP·XX, Bare head of Augustus facing left
Reverse: PONTIF·MAXIM·TRIBVN·POT·XXXIIII·, Inscription around large SC
Ref: RIC I (2nd Ed.) Augustus 471
(12) Augustus 15-after 10 BC
Obverse: CAESAR PONT MAX, Bare head of Augustus facing right
Reverse: ROM ET AVG, Front elevation of the Altar of Lyons, decorated with the corona civica between laurels, these being flanked by nude male figures to left and right, Victories on columns facing eachother
Ref: RIC I (2nd Ed.) Augustus 230
(13) Augustus ca. 25 BC
Obverse: CAESAR, Bare head of Augustus facing right
Reverse: AVGVSTVS, Inscription inside laurel wreath
Ref: RIC I (Second Edition) Augustus 486...
(14) Augustus ca. 25 BC
Obverse: CAESAR, Bare head of Augustus facing right; TI.CAE and AVG rectangular punches
Reverse: AVGVSTVS, Inscription inside laurel wreath
Ref: RIC I (Second Edition) Augustus 486...
(15) Augustus ca. 25 BC
Obverse: CAESAR, Bare head of Augustus facing right; TI.CAE and AVG rectangular punches
Reverse: AVGVSTVS, Inscription inside laurel wreath
Ref: RIC I (Second Edition) Augustus 486...
(16) Augustus 25-23 B.C.
Obverse: CAESAR AVG TRIB POTEST Barehead right
Reverse: P CARISIVS - LEG - AVGVSTI in three lines
Ref: RIC I 15a ; BMCRE 298
(17) Augustus 25-23 BC
Obverse: CAESAR AVGVST TRIB (or TRIBVN or TRIBVNI) POTEST, Bare head of Augustus facing right
Reverse: P. CARISIVS LEG AVGVSTI, Inscription in three lines
Ref: RIC I (Second Edition) Augustus 23,...
(18) Augustus 15 BC
Obverse: CAESAR AVGVSTVS TRIBVNIC POTEST, Bare head of Augustus facing right
Reverse: L SVRDINVS IIIVIR AAAFF, Inscription around large SC
Ref: RIC I (Second Edition) Augustus 386
(19) Augustus 10-6 BC
Obverse: laureate head right; CAESAR__PONT MAX
Reverse: front elevation of the Altar of Lugdunum, decorated with the corona civica between laurels, these being flanked by nude male figures, Victories on columns, facing one another; ROM ET AVG
Ref: RIC I 230, BMCRE I 549, SRCV I 1690...
(20) Augustus 22-30 AD
Obverse: radiate head left; DIVVS AVGVSTVS PATER
Reverse: altar wtih double panelled door; S__C / PROVIDENT
Ref: RIC I Tiberius 81, BMCRE I 146, Coh...
(21) Augustus 15-after 10 BC
Obverse: CAESAR PONT MAX, Head of Augustus facing right, wearing laurel wreath
Reverse: Altar of Lugdunum, highly decorated with corona civica, laurels, and nude male figures; Victories flanking; ROM ET AVG in exergue
Ref: RIC I (2nd Ed.) Augustus 230; BMC 5...
(22) Augustus | Agrippa 20-10 BC
Obverse: IMP DIVI F, Head of Agrippa facing left, wearing combined rostral crown and laurel wreath, bare head of Augustus facing right
Reverse: COL NEM, Crocodile chained to palm-shoot with tip right; above palm-tip left a wreath with long ties
Ref: RIC I (2nd Ed.) Augustus 155
(23) Aurelian 275 AD
Obverse: laureate and cuirassed bust right; IMP AVRELIANVS AVG
Reverse: Aurelian standing left, wearing military dress, holding long scepter clapsing hand with Severina standing right, radiate bust of Sol above; CONCOR_DIA__AVG / Γ
Ref: BNC p.307; RIC1st 80 http://www.ric...
(24) Caligula 37-38 AD
Obverse: C CAESAR AVG GERMANICVS PON M TR POT, bare head left
Reverse: VESTA, Vesta enthroned left, patera extended in right, long scepter transverse in left, S - C flanking across field
Ref: RIC I 38, Cohen I 27, BMCRE I 46, S...
(25) Caligula AD 37-38
Obverse: C CAESAR AVG GERMANICVS PON M TR POT, bare head left
Reverse: VESTA, Vesta seated left on ornamental throne, holding patera and sceptre; S-C across field
Ref: RIC 38; Sear 1803
(26) Caligula 37-38 AD
Obverse: C CAESAR AVG GERMANICVS PON M TR POT, bare head of Caligula left.
Reverse: Reverse: VESTA above, S C across field, Vesta seated left, holding patera and sceptre.
Ref: RIC I 38; BMCRE I 46; RSC I 27.
(27) Caracalla 211 AD
Obverse: ANTONINVS PIVS AVG BRIT, laureate bust right, drapery on far shoulder
Reverse: VICTORIAE BRITTANNICAE, S-C across field, Victoria standing right, left foot on helmet, inscribing shield hung on a palm.
Ref: RIC IV 522a; Cohen 636
(28) Claudius 41-42 AD
Obverse: TI CLAVDIVS CAESAR AVG PM TRP IMP - Bare head of Claudius left
Reverse: S C, Minerva, advancing right, brandishing spear and holding shield
Ref: RIC:100, Sear:1861
(29) Claudius 41-42 A.D.
Obverse: TI CLAVDIVS CAESAR AVG P M TR P IMP, bare head left.
Reverse: S-C across fields, Minerva standing right, brandishing spear and holding shield on left arm.
Ref: RIC I 100
(30) Claudius 41-54 AD
Obverse: TI CLAVDIVS CAESAR AVG P M TR P IMP Bare head left.
Reverse: S - C Minerva advancing right, brandishing spear and holding shield.
Ref: RIC 100; BMCRE 149.
(31) Claudius 41-42 AD
Obverse: bare head left; TI CLAVDIVS CAESAR AVG P M TR P IMP
Reverse: Minerva standing right, brandishing spear and holding shield on left arm; S C
Ref: RIC I 100, SRCV I 1861, BMCRE I 149
(32) Claudius 41-42 AD
Obverse: bare head left; TI CLAVDIVS CAESAR AVG P M TR P IMP
Reverse: Minerva standing right, brandishing spear and holding shield on left arm; S C
Ref: RIC I 100, SRCV I 1861, BMCRE I 149
(33) Clodius Albinus 194-195 AD
Obverse: bare head right; D CL SEPT AL_BIN CAES
Reverse: Saeculum Frugiferum standing left, holding caduceus with grain ears and trident; SAECVLO FRVGIFERO COS II / S__C
Ref: RIC IVa, 61 (C. 72); BMC V, 549 (Pl...
(34) Commodus 175-176 AD
Obverse: Draped bust right from behind; COMMODO CAES AVG FIL GERM SARM
Reverse: Jug, knife and sprinkler left, lituus and simpulum right; PIETAS AVG / S C
Ref: RIC III 1539 (Aurelius); MIR 18, 34...
(35) Crispina 180-182 AD
Obverse: draped bust right; CRISPINA__AVGVSTA
Reverse: Juno standing left holding scepter and patera; IVNO LV_CINA / S__C
Ref: RIC III 680, Cohen 24, BMCRE IV 433...
(36) Domitian 76-77 AD
Obverse: CAESAR AVG F DOMITIANVS COS IIII, Head of Domitian facing right, wearing laurel wreath
Reverse: AEQVITAS AVGVST, Aequitas standing facing, head left, holding scales and scepter; SC in fields
Ref: RIC II Part I (Second Edition) Vesp...
(37) Domitian 92-94 AD
Obverse: IMP CAESAR DOMIT AVG GERMCOSXVICENSPERPP - Laureated head right
Reverse: MONETA AVGVSTI - Moneta standing left, holding scales and cornucopia
Ref: RIC 408, S 2807
(38) Domitian 90-91 AD
Obverse: IMP CAES DOMIT AVG GERM COSXV CENS PER PP
Reverse: VIRTVTI AVGVSTI S.C, Virtus standing right, left foot on helmet holding spear and parazonium
Ref: Sear 2817, RIC 397
(39) Domitian 81-96 A.D.
Obverse: Laureate head bust with Aegis
Reverse: Moneta standing holding balance and cornucopia
Ref: RIC 221
(40) Domitian 88-89 AD
Obverse: IMP CAES DOMIT AVG GERM COS XIIII CENS PER P P, Head of Domitian facing right, wearing laurel wreath
Reverse: FORTVNAE AVGVSTI, Fortuna standing facing, head left, holding rudder and cornucopia; SC in fields
Ref: RIC II Part 1 (2nd Ed.) Domitian 64...
(41) Domitian AD 87
Obverse: IMP CAES DOMIT AVG GERM COS XIII CENS PER PP, laureate head right
Reverse: VIRTVTI AVGVSTI, Virtus standing right, left foot on helmet, holding spear and parazonium; S C across fields
Ref: RIC 550
(42) Domitian 82 AD
Obverse: laureate head right; IMP CAES DIVI VES P F DOMITIAN AVG P M
Reverse: Minerva with aegis holding spear and shield; TR P COS VIII__DES VIIII P P / S__C
Ref: RIC 110 (RIC [1962] 242a), Cohen 58...
(43) Domitian 73 AD
Obverse: laureate head left; CAESAR AVG F DOMITIAN COS II
Reverse: Aequitas standing left, holding scales and scepter; AEQVITAS__AVGVST / S C
Ref: RIC 666[vesp], Cohen 1.
(44) Domitian 88-89 AD
Obverse: Laureate head right; IMP CAES DOMIT AVG GERM COS XIIII CENS PER P P
Reverse: Fortuna standing left, holding rudder and cornucopia; FORTVNAE__AVGVSTI / S__C
Ref: RIC 648, (RIC [1962] 371), Cohen 12...
(45) Drusus II 22-23 AD
Obverse: DRVSVS CAESAR TI AVG F DIVI AVG N, Bare head of Drusus facing left
Reverse: PONTIF TRIBVN POTEST ITER. Large SC at center
Ref: RIC I (2nd Ed.) Tiberius 45
(46) Faustina I 147-161 AD
Obverse: draped bust right; DIVA__FAVSTINA
Reverse: Vesta standing left with palladium and torch; AVG_V_STA / S C
Ref: RIC 989
(47) Faustina II 161-175 AD
Obverse: FAVSTINA AVGVSTA, Bust of Faustina facing right, wearing drapery
Reverse: SAECVLI FELICIT, Two children seated on throne, SC in fields
Ref: RIC III Marcus Aurelius 1666
(48) Faustina II 161-175 AD
Obverse: diademed and draped bust right; FAVSTINA AVGVSTA
Reverse: Faustina II facing, holding 2 children, 2 children at her feet; FECVND__AVGVSTAE / S C
Ref: RIC 1636, Cohen 97, BMC 977
(49) Galba 68 AD
Obverse: Head right
Reverse: Pax standing left
Ref: RIC 281
(50) Germanicus 42 AD
Obverse: bare head right; GERMANICVS CAESAR TI AVG F DIVI AVG N
Reverse: S·C; TI CLAVDIVS CAESAR AVG GERM P M TR P IMP P P
Ref: SRCV I 1905, RIC I 106, BMCRE I 215
(51) Germanicus 40-41 A.D.
Obverse: GERMANICVS CAESAR TI AVG F DIVI AVG N, bare head left
Reverse: C CAESAR DIVI AVG PRON AVG P M TR P IIII P P around large SC.
Ref: RIC 50
(52) Germanicus 40-41 AD
Obverse: GERMANICVS CAESAR TI AVG F DIVI AVG N, Bare head of Germanicus facing left
Reverse: C CAESAR DIVI AVG PRON AVG PM TR P IIII P P, Inscription around large SC
Ref: RIC I Caligula 50
(53) Hadrian 124-128 AD
Obverse: HADRIANVS AVGVSTVS, laureate head right
Reverse: SALVS AVGVSTI S-C, COS III below, Salus standing left holding patera, feeding serpent arising from altar
Ref: RIC 678, Cohen 1357, BMC 1349
(54) Hadrian 125-128 AD
Obverse: Laureate head right; HADRIANVS__AVGVSTVS
Reverse: Salus standing left with patera, feeding snake on altar; SALVS__AVGVSTI / S__C / COS III
Ref: RIC II 678
(55) Hadrian 134-138 AD
Obverse: laureate head right; HADRIANVS_AVGVSTVS P P
Reverse: Salus standing right feeding snake in her arms; COS__III / S__CSalus standing right feeding snake in her arms; COS__III / S__C
Ref: RIC 975, Cohen 371v, BMC 1380
(56) Hadrian 134-138 AD
Obverse: laureate head right; HADRIANVS__AVG COS III P P
Reverse: Hispania reclining left, holding branch, rabbit at her feet; HISPAN_IA / S C
Ref: RIC II 852; BMCRE 1752; Cohen 838
(57) Marcus Aurelius 159-160 AD
Obverse: AVRELIVS CAESAR AVG PII F, Bare head of Aurelius facing right
Reverse: TR POT XIIII COS II, Mars advancing right, carrying spear and trophy, SC in fields
Ref: RIC III Antoninus Pius 1354Ba
(58) Marcus Aurelius 174-175 AD
Obverse: laureate head right; M ANTONINVS_AVG TR P XXIX
Reverse: Tiber reclining left, hand on prow of galley; IMP VII COS III / S C
Ref: cf. RIC III 1142, Cohen 348
(59) Nero 66 AD
Obverse: IMP NERO CAESAR AVG P MAX TRP PP
Reverse: Victory alighting left, holding shield inscribed SPQR, with S C across field
Ref: RIC 543
(60) Nero 66 AD
Obverse: IMP NERO CAESAR AVG GERM, Head of Nero facing left, wearing laurel wreath
Reverse: PACE P R VBIQ PARTA IANVM CLVSIT, View of one front of the temple of Janus, with latticed window to left, and garland hung across closed double doors on the right;SC in fields
Ref: RIC 348
(61) Nerva 97 AD
Obverse: laureate head right; IMP NERVA CAESAR AVG_P M TR P COS III P P
Reverse: Aequitas holding scales and cornucopiae; AEQVITAS__AVGVST / S C
Ref: RIC II 77, BMCRE III 127, Cohen 7, ...
(62) Septimius Severus 211 AD
Obverse: laureate bust right; SEVERVS__PIVS AVG BRIT
Reverse: Victory standing right, holding vexillum with both hands, two captives seated on either sides facing each other; P M TR P XVIII COS__III P P / S__C
Ref: obv: RIC IV 812b; Cohen 724 // rev:...
(63) Tiberius 22-23 AD
Obverse: TI CAESAR DIVI AVG F AVGVST IMP VIII, Bare head of Tiberius facing left
Reverse: PONTIF MAXIM TRIBVN POTEST XXIIII, Inscription around large SC
Ref: RIC I (Second Edition) Tiberius 44
(64) Tiberius 12-14 AD
Obverse: TI CAESAR AVGVST F IMPERAT VII, Head of Tiberius facing right, wearing laurel wreath
Reverse: ROM ET AVG, Altar highly decorated with corona civica, laurels, and nude male figures; Victories flanking
Ref: RIC I (Second Edition) Augustus 245
(65) Tiberius 36-37 AD
Obverse: laureate head left; TI CAESAR•DIVI•AVG F AVGVST•IMP•VIII
Reverse: rudder across globe, handel to the right, diagonally banded; small globe to the left; PONTIF_•MAX•TR•__POT•XXXIIX / S__C
Ref: RIC I 64, BMCRE I 136-137, BN 123
(66) Tiberius 34-36 AD
Obverse: laureate head left; TI CAESAR DIVI AVG F AVGVST IMP VIII
Reverse: winged caduceus; PONTIF MAXIM TRIBVN POTEST XXX?? / S__C
Ref: RIC I 53 (XXXVII); RIC I 59 (XXXVII...
(67) Tiberius 15-16 AD
Obverse: TI·CAESAR·DIVI·AVG·F·AVGVST·IMP·VII·, Bare head of Tiberius facing left
Reverse: PONTIF·MAXIM·TRIBVN·POTEST·XVII·, Livia as Pax seated facing right, feet on stool, holding scepter and patera
Ref: RIC I (2nd Ed.) Tiberius 34; BMC 68...
(68) Titus AD 79-81
Obverse: DIVVS AVGVSTVS PATER, radiate head of Augustus left, star above head
Reverse: IMP T CAES AVG RESTITVIT S C, eagle standing facing on globe, head right, wings open
Ref: RIC (Titus) 462; Sear 2584
(69) Titus 80-81 AD
Obverse: IMP T CAES VESP AVG PM TR P COS VIII, Head of Titus facing right, wearing laurel wreath
Reverse: AEQVITAS AVGVST, Aequitas standing facing, head left, holding scales and scepter; SC in fields
Ref: RIC II Part 1 (2nd Ed.) Titus 214
(70) Trajan 103-111 AD
Obverse: laureate bust right, draped shoulder; IMP CAES NERVAE TRAIANO AVG GER DAC P M TR P COS V P P
Reverse: Pax seated left, holding olive branch, Dacian kneeling right; S•P•Q•R•OPTIMO PRINCIPI / S•C
Ref: RIC 513
(71) Trajan 98-99 AD
Obverse: laureate head right; IMP CAES NERVA TRAIAN AVG GERM P M
Reverse: Pietas raising hand, altar left P M TR POT__COS II / S C
Ref: RIC 392, Cohen 613, BMC 724
(72) Trajan 105 AD
Obverse: laureate head right; IMP CAES NERVAE TRAIANO AVG GER DAC P M TR P COS V P P
Reverse: arched single-span bridge covered walkway separated by vertical bars and middle curved line, each gateway surmounted by statuary, right one with flight of steps; boat on river below; SPQR OPTIMO PRINCIPI / S C
Ref: SRCV II 3235, RIC II 569, Cohen II ...
(73) Trajan 98-99 AD
Obverse: IMP CAES NERVA TRAIAN AVG GERM P M / laureate head right
Reverse: TR POT COS II P P / Victory walking left, holding palm-branch and shield inscribed SPQR
Ref: RIC 402
(74) Vespasian 76 AD
Obverse: IMP CAESAR VESP AVG COS VII, Head of Vespasian facing right, wearing laurel wreath
Reverse: AEQVITAS AVGVST, Aequitas standing facing, head left, holding scales and scepter; SC in fields
Ref: RIC II Part I (Second Edition) Vesp...
(75) Vespasian 71 AD
Obverse: laureate head right; IMP CAES VESPASIAN AVG COS III
Reverse: Aequitas holding scales and scepter AEQVITAS__AVGVSTI / S__C
Ref: RIC II 482, Cohen 13
(76) Vespasian 71 AD
Obverse: IMP CAES VESPASIAN AVG P P COS III, laureate head right.
Reverse: AEQVITAS - AVGVSTI, Aequitas standing left, holding scales and rod in field, S - C.
Ref: RIC I 482 = II 286 C 13