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
/Files/Images/Coinsite/CoinDB/quadrans_Mars.jpg
An AE Quadrans struck 81-161 AD in Rome
Obverse: cuirassed and helmeted bust of Mars right

Reverse: cuirass; S__C

Diameter: 17 mm
Die Orientation: -
Weight: 2.57 g
(Domitian - Antoninus Pius)
RIC II Anonymous 19
Roman Imperial (Adoptive Emperors)
(2) Anonymous
/Files/Images/Coinsite/CoinDB/T114176_(Obv_and_Rev).jpg
An AE Quadrans struck AD 81-161 in Rome
Obverse: Helmeted and cuirassed bust of Mars right

Reverse: Cuirass; S-C across fields

Diameter: 16 mm
Die Orientation: 7 H
Weight: 2.74 g
Attributed to the period Domitian - Antoninus Pius. Previously in the collection of John Casey, British archeologist and author.
RIC 19; Sear 2922
Roman Imperial (Adoptive Emperors)
(3) Anonymous
/Files/Images/Coinsite/CoinDB/1657_Metal_Aurelianis.jpg
An AE Quadrans struck 161-180 AD in Pannonia
Obverse: laureate and draped female bust right

Reverse: legend within wreath; METAL / AVRELIA / NIS

Diameter: 15 mm
Die Orientation: -
Weight: 2.5 g
No notes for this coin
RIC II 1255; Simic and Vasic, "La Monnaie des Mines Romaines de L
Roman Imperial (Adoptive Emperors)
(4) Augustus
/Files/Images/Coinsite/CoinDB/348_Augustus_quadrans.JPG
An AE Quadrans struck 9 BC in Rome
Obverse: altar; III•VIR•A•A•A•F•F•

Reverse: cornucopiae; LAMIA SILIVS ANNIVS / S__C

Diameter: 15 mm
Die Orientation: -
Weight: 2.75 g
Lamia, P. Silius, C. Annius moneyers
RIC I 422
Roman Imperial (Twelve Caesars)
(5) Augustus
/Files/Images/Coinsite/CoinDB/Untitled(88).jpg
An AE Quadrans struck 9 BC in Rome
Obverse: LAMIA SILIVS ANNIVS, Clasped hands holding caduceus

Reverse: III VIR AAAFF surrounding large SC

Diameter: 18 mm
Die Orientation: 10 H
Weight: 3 g
L. Aelius Lamia, P. Silius, and C. Annius as moneyers
RIC I (Second Edition) Augustus 420
Roman Imperial (Twelve Caesars)
(6) Augustus
/Files/Images/Coinsite/CoinDB/Augustus(5).jpg
An AE Quadrans struck 15-10 BC in Lugdunum
Obverse: IMP CAESAR, Head of Augustus facing right, wearing laurel wreath

Reverse: AVGVSTVS, Eagle standing facing with wings spread, head to left

Diameter: 18 mm
Die Orientation: 3 H
Weight: 1.87 g
RPC calls the metal brass
RIC I (Second Edition) Augustus 227, RPC I 508
Roman Imperial (Twelve Caesars)
(7) Claudius
/Files/Images/Coinsite/CoinDB/38_Claudius_quadrans.jpg
An AE Quadrans struck 41 AD in Rome
Obverse: modius; TI CLAVDIVS CAESAR AVG

Reverse: legend around S•C; PON M TR P IMP COS DES IT

Diameter: 15 mm
Die Orientation: -
Weight: 3.12 g

25 Jan - 3 Dec 41 AD

RIC I 84, Cohen I 70, BMCRE I 179, BnF II 185, Hunter I 74, SRCV I 1863
Roman Imperial (Twelve Caesars)
(8) Domitian
/Files/Images/Coinsite/CoinDB/Domitian_quadrans_rhino.jpg
An AE Quadrans struck 84-85 AD in Rome
Obverse: Rhinoceros left

Reverse: S C; IMP DOMIT AVG GERM

Diameter: 19 mm
Die Orientation: -
Weight: 3.2 g

Commemorates colosseum opening

SRCV I 2835; RIC II-1 250; BMC 498
Roman Imperial (Twelve Caesars)
(9) Hadrian
/Files/Images/Coinsite/CoinDB/Untitled(28).jpg
An AE Quadrans struck 121-122 AD in Rome
Obverse: IMP CAESAR TRAIAN HADRIANVS AVG, Eagle standing facing, head right

Reverse: P M TR P COS III, Winged thunderbolt; SC below

Diameter: 19 mm
Die Orientation: 6 H
Weight: 3.02 g
No notes for this coin
RIC II Hadrian 624
Roman Imperial (Adoptive Emperors)
(10) Trajan
/Files/Images/Coinsite/CoinDB/Trajan_Quadrans_She-Wolf.jpg
An AE Quadrans struck 98-117 AD in Rome
Obverse: IMP CAES NERVA TRAIAN AVG / Laureate bust right, drapery on left shoulder

Reverse: She-wolf standing right, S C in exergue

Diameter: 17 mm
Die Orientation: 0 H
Weight: 3.22 g
No notes for this coin
RIC 692
Roman Imperial (Adoptive Emperors)