The Quinarius denomination
The quinarius was a small silver Roman coin valued at half a denarius.

Initially, the quinarius was struck for a few years, along with the silver sestertius, following the introduction of the denarius in 211 BC. At this time the quinarius was valued at 5 asses.

The coin was reintroduced in 101 BC as a replacement for the victoriatus, this time valued at 8 asses due to retariffing of the denarius to 16 asses in 118 BC.

For a few years following its reintroduction, large quantities of quinarii were produced, mostly for circulation in Gaul. The coin was produced sporadically until the 3rd century. It was also occasionally struck in gold.
Quinarius

(1) Aedui
Obverse:
Reverse:
Ref: None provided
(2) Allectus AD 294-296
Obverse: IMP C ALLECTVS P F AVG, radiate and cuirassed bust right, with decorated shoulder straps
Reverse: LAETITIA AVG, galley right, with mast and six oars; QC in exergue
Ref: RIC 124; Sear 12867
(3) Allectus 293-296 AD
Obverse: IMP C ALLECTVS PF AVG, Bust of Allectus facing right, wearing crown and cuirass
Reverse: VIRTVS AVG, Galley rowing left; QC mint mark in exergue
Ref: RIC V Allectus 128
(4) Amdan Bayyin 50-100 AD
Obverse: Male head right, serpent torc around
Reverse: 'MDNIBYNI around, RYDN in exergue, small head right; sceptre symbol before
Ref: Munro-Hay 3.2ai; SNG ANS 1575
(5) Augustus 25-23 BC
Obverse: AVGVST, Bare head of Augustus facing left
Reverse: P CARISI LEG, Victory standing facing right, crowning trophy of captured arms, dagger and curved sword at base
Ref: RIC I (Second Edition) Augustus 1b
(6) Augustus c. 25-23 BC
Obverse: bare head right; AVGVST
Reverse: Victory standing right, placing wreath on a trophy consisting of helmet and cuirass; dagger and sword hilt at base of trophy; P CARIS_I__LEG
Ref: RIC 1a; sear5 1642; RSC 386
(7) C. Fundanius 101 BC
Obverse: Laureate head of Jupiter right; C to left.
Reverse: Victory standing right, crowning trophy, beside which stands carnyx; before which, Gallic captive kneeling left; Q (mark of value) in exergue.
Ref: Crawford 326/2
(8) Caracalla 214 AD
Obverse: ANTONINVS PIVS AVG GERM, Bust of Caracalla facing right, wearing laurel wreath, cuirass, and drapery
Reverse: COS IIII P P, Victory advancing left, holding wreath and palm
Ref: RIC IV Caracalla 317a
Obverse: Laureate head of Jupiter right.
Reverse: Victory standing right, crowning trophy; CN LENT in exergue (NT in monogram)
Ref: RSC Cornelia 51; Sear 255; Crawford...
(10) Galba 68-69 AD
Obverse: SER GALBA IMP CAESAR AVG P M T P, Head of Galba facing right, wearing laurel wreath
Reverse: VICTORIA GALBAE AVG, Victory wearing drapery, standing facing left on top of globe, holding wreath and palm
Ref: RIC I (Second Edition) Galba 131
Obverse: Laureate head of Apollo right, club (control mark) in left field.
Reverse: Victory advancing right, holding wreath and palm-branch, L PI - SO across fields, FRVGI in exergue.
Ref: Crawford 340/2e
(12) M. Porcius Cato 91 (89)BC
Obverse: head of young Bacchus or Liber right wearing ivy wreath, M·C(AT)O R
Reverse: Victory seated right, holding patera and palm VIC(TR)IX
Ref: Crawford 343/2b, SRCV I 248, Sydenh...
Obverse: head of Bacchus or Liber right wearing ivy wreath; M·C(AT)O·PRO·PR
Reverse: seated Victory right holding patera and palm; VIC(TR)IX
Ref: Crawford 462/2, SRCV I 1383, Sydenh...
(14) Marcus Antonius 42 BC
Obverse: Winged bust of Victory right, with the likeness of Fulvia; III·VIR downwards in left field; R·P·C upwards in right field.
Reverse: Lion walking right; ANTONI above; A - XLI ( = 41, Antony’s age at time of issue) across field; IMP in exergue.
Ref: Crawford 489/6
(15) Octavian 27-29 BC
Obverse: CAESAR IMP•VII – Head of Octavian.
Reverse: ASIA RECEPTA – Victory draped, standing looking left, holding wreath in right hand. On cista mystica between two snakes
Ref: RIC 276, RSC 14
(16) Octavian 29-27 BC
Obverse: CAESAR IMP VII, Bare head of Octavian facing right
Reverse: ASIA RECEPTA, Victory standing facing left, holding wreath and palm, on top of cista mystica, serpents at left and right
Ref: RIC I (2nd Ed.) Augustus 276; RSC I...
(17) Rome | Anonymous 211-210 BC
AR Quinarius Apulia
Obverse: head of Roma right wearing crested helmet
Reverse: Dioscuri on horses riding right, holding spear and reins, stars over pilei; ROMA
Ref: Crawford 102/2d
Obverse: laureate head of Jupiter right, dot over N
Reverse: Victory standing right, holding wreath and palm. Trophy with Gallic captive seated left, T·CLO(VL)I, Q
Ref: Crawford 332/1b, SRCV I 212, Sydenh...
(19) Vindelici 70-30 BC
Obverse: stylized head with strands left (precursor of the Büschelquinar type)
Reverse: horse left; pellet above
Ref: Kellner, Gruppe A, CCCBM II 215-216...