The Quadrans denomination
The quadrans (literally meaning "a quarter") or teruncius ("three unciae") was a low-value Roman bronze coin worth one quarter of an as.

The quadrans was issued from the beginning of cast bronze coins during the Roman Republic with three pellets representing three unciae as a mark of value.

The obverse type, after some early variations, featured the bust of Hercules, while the reverse featured the prow of a galley. Coins with the same value were issued from other cities in Central Italy, using a cast process.
Quadrans

(1) Anonymous After 211 BC
Obverse: Head of Hercules right, wearing lion's skin headdress; behind, three pellets.
Reverse: Prow of galley right, ROMA above, three pellets below.
Ref: Crawford 56/5
(2) Anonymous 81-161 AD
Obverse: cuirassed and helmeted bust of Mars right
Reverse: cuirass; S__C
Ref: RIC II p. 218, 19
(3) Arse | Saguntum c. 200-150 BC
Obverse: Shell
Reverse: Dolphin right, crescent above, P (A in iberian script) and three dots below
Ref: R&L 153-79; ACIP 1974; SNG BM Spain...
(4) Arse | Saguntum c. 200-150 BC
Obverse: Shell
Reverse: Dolphin right, crescent above, P (A in iberian script) and three dots below
Ref: None provided
(5) Augustus ca. 21 BC
Obverse: IMP CAESAR DIVI F, Bare head of Augustus facing right
Reverse: A PLAVTIVS PROCOS, Temple of Aphrodite at Paphos, containing conical xoanon; semicircular courtyard
Ref: RPC I 3906
(6) Augustus 9 BC
Obverse: altar; III•VIR•A•A•A•F•F•
Reverse: cornucopiae; LAMIA SILIVS ANNIVS / S__C
Ref: RIC I 422
(7) Augustus 9 BC
Obverse: LAMIA SILIVS ANNIVS, Clasped hands holding caduceus
Reverse: III VIR AAAFF surrounding large SC
Ref: RIC I (Second Edition) Augustus 420
(8) Augustus 15-10 BC
Obverse: IMP CAESAR, Head of Augustus facing right, wearing laurel wreath
Reverse: AVGVSTVS, Eagle standing facing with wings spread, head to left
Ref: RIC I (Second Edition) Augustus 227...
(9) Brundisium ca. 215 BC
Obverse: Head of Poseidon facing right, wearing laurel wreath, being crowned by Nike at left; trident and 3 dots below
Reverse: Phalanthos, nude, riding dolphin to left, holding large cithara, Nike crowning him; BRVN below; three pellets below
Ref: SNG ANS.792
(10) C. Numitorius 136? (133)BC
Obverse: head of Hercules right wearing lion skin, club below ●●●
Reverse: prow of galley right ●●● C·NVMITRI ROMA
Ref: Crawford 246/4a
(11) Castulo c. 120-100 BC
Obverse: Diademed head right
Reverse: Boar right, star (comet)* above; KaŚTiLO
Ref: Villaronga p. 337, 50; SNG BM Spain...
(12) Claudius 41 AD
Obverse: modius; TI CLAVDIVS CAESAR AVG
Reverse: legend around S•C; PON M TR P IMP COS DES IT
Ref: RIC I 84, Cohen I 70, BMCRE I 179, ...
(13) Domitian 84-85 AD
Obverse: Rhinoceros left
Reverse: S C; IMP DOMIT AVG GERM
Ref: SRCV I 2835; RIC II-1 250; BMC 498
(14) Hadrian 121-122 AD
Obverse: IMP CAESAR TRAIAN HADRIANVS AVG, Eagle standing facing, head right
Reverse: P M TR P COS III, Winged thunderbolt; SC below
Ref: RIC II Hadrian 624
Obverse: Head of Hercules right, wearing lion’s skin; behind, three pellets and below neck truncation club.
Reverse: Prow right; before, three pellets, above M·ABVRI MF / GEM, and below, ROMA.
Ref: Crawford 250/2, Sydenham 488, Aburi...
(16) Rome | Anonymous 225-217 BC
Obverse: head of Hercules left wearing lion's skin ●●●
Reverse: prow of galley right ●●●
Ref: Crawford 35/4; Thurlow & Vecchi 54;...
(17) Rome | Anonymous 211-206 BC
AE Quadrans Sardinia?
Obverse: head of Hercules right wearing lion skin; ●●●
Reverse: prow of galley right ROMA; ●●●
Ref: Crawford cf. 56/5; RBW 210. Cf.; Mc...