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It is a Caesar denarius minted in 49 BC. This was the first type of coin Caesar had minted. The obverse is an elephant trampling a snake with CAESAR beneath. The reverse features the fetishes of the Pontifex Maximus, a title Caesar held at the time. See Roman Republican Coinage by Michael Crawford.
Licence: Creative Commons Share Alike Attribution 2.5 - Classical Numismatic Group, Inc.