Cr 339/?? AE Sextans Anonymous/unofficial?

An odd coin, seemingly a late Sextans, but none are identified by Crawford among his No. 339 group of late bronze. He speculated that the lower denominations may be unofficial; McCabe seems to have found an official quadrans, posted on his site.
c. 91 BC (?)
o: Head of Mercury right; above, ROMA; below, two pellets
r: Prow right; above, ROMA; below, two pellets
1.77 gm 14.50 mm
Time to put this on the research list.

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