The Sextans denomination
The sextans was an Ancient Roman bronze coin produced during the Roman Republic valued at one-sixth of an as (2 unciae).

The most common design for the sextans was the bust of Mercury and two pellets (indicating two unciae) on the obverse and the prow of a galley on the reverse.

Earlier types depicted a scallop shell, a caduceus, or other symbols on the obverse.
Sextans
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An AE Sextans struck 211 BC in Sardinia
Obverse: draped bust of Mercury right wearing winged petasos; ●●

Reverse: prow of galley right, fighting platform with club; ROMA / C /●●

Diameter: -
Die Orientation: -
Weight: 4 g
If C really stood for L. Cornelius Lentulus praetor of Sardinia, he would be the first moneyer with name on his coins.
Crawford 63/6, Sydenham 157d, BMCRR Italy 187, SRCV I 1220
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An AE Sextans struck 211-208 BC in Herdonia?
Obverse: draped bust of Mercury right wearing winged petasos ●●

Reverse: prow of galley right, fighting platform with club ROMA ●●

Diameter: -
Die Orientation: -
Weight: 3.8 g
Mint in southeast Italy, possibly Apulia (Herdonia?) Scarce
Crawford 056/06, McCabe F1.Sx.2 Luceria-style (die-match)
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An AE Sextans struck 211-210 BC in Sicily
Obverse: draped bust of Mercury right wearing winged petasos ●●

Reverse: prow of galley right, fighting platform with club; grain ear above ROMA ●●

Diameter: -
Die Orientation: -
Weight: 5.9 g
maybe overstrike ex RBW ex Richard Schäfer
Crawford 72/8; Sydenham 195d; RBW 311
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An AE Sextans struck 206-190 BC in Rome
Obverse: draped bust of Mercury right wearing winged petasos, ●●

Reverse: prow of galley right; ROMA / ●●

Diameter: -
Die Orientation: -
Weight: 7.4 g
No notes for this coin
Crawford 056/06, McCabe J1.Sx.1
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An AE Sextans struck 211-208 BC in Sicily
Obverse: draped bust of Mercury right wearing winged petasos; ●●

Reverse: prow of galley with corvus right, grain ear above; I< / ROMA

Diameter: -
Die Orientation: -
Weight: -
No notes for this coin
Crawford 069/06b; RBW 294