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
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An AE Quadrans struck After 211 BC in Rome
Obverse: Head of Hercules right, wearing lion's skin headdress; behind, three pellets.

Reverse: Prow of galley right, ROMA above, three pellets below.

Diameter: 20 mm
Die Orientation: -
Weight: 5.79 g
No notes for this coin
Crawford 56/5
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An AE Quadrans struck 136? (133)BC in Rome
Obverse: head of Hercules right wearing lion skin, club below ●●●

Reverse: prow of galley right ●●● C·NVMITRI ROMA

Diameter: -
Die Orientation: -
Weight: 2.2 g
No notes for this coin
Crawford 246/4a
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An AE Quadrans struck 132 BC in Rome
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.

Diameter: 19 mm
Die Orientation: 0 H
Weight: 8.34 g
No notes for this coin
Crawford 250/2, Sydenham 488, Aburia 7.
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An Aes grave Quadrans struck 225-217 BC in Rome
Obverse: head of Hercules left wearing lion's skin ●●●

Reverse: prow of galley right ●●●

Diameter: -
Die Orientation: -
Weight: 64.8 g
scarce
Crawford 35/4; Thurlow & Vecchi 54; Haeberlin pl. 18, 1-9
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An AE Quadrans struck 211-206 BC in Sardinia?
Obverse: head of Hercules right wearing lion skin; ●●●

Reverse: prow of galley right ROMA; ●●●

Diameter: -
Die Orientation: -
Weight: -
Sardinia, Sicily or south Italy Probably overstrike on Cartaginian Tanit/horse head issue from Sardinia: http://www.ancientcoingallery.net/Files/Images/Coinsite/CoinDB/345_Carthage_horse_head.jpg
Crawford cf. 56/5; RBW 210. Cf.; McCabe H1