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LEG PRI - Legio Prima, with the eagle and ensigns of the first legion, on a silver coin of Mark Antony. 

This is the rarest of Antony's legionary coinage.  It is not to be confused with Octavian's Legio I which was raised by Caesar.

There is also a 1st Legion raised by Pompey in 84 BC which was believed to be disbanded by Vespasian in 74 AD

View whole page from the |Dictionary Of Roman Coins|