COIN (ROMAN)
A Roman silver coin; a legionary denarius of Marc Antony, dating from 32-31 BC (Reece period 1). RRC 544/35. 

The obverse depicts a praetorian galley, right. The inscription is illegible. There appears to be a counterstamped P above the galley. The reverse depicts an aquila (legionary eagle) between two standards. The inscription reads LEG XIX, denoting the nineteenth legion. Measurements are; diameter 16.6mm, thickness 1.7mm and weight 2.87g.

See http://numismatics.org/crro/id/rrc-544.35. See SWYOR-0DC82D for a better preserved example on the database. 

Compare with HAMP-751426 which notes that: "These coins were struck by Mark Antony for the use of his fleet and legions when he was preparing for the struggle with Octavius, which culminated in the Battle of Actium on the 2nd of September, 31 BC (Grueber, 1970, 526). Some legionary denarii remained in circulation until the 3rd century AD."
Ruler: Republic
Moneyer: Antonius, M.
Denomination: Denarius (Roman Republic)
Material: Silver
Mint: Moving with Republican issuer
Obverse: Galley, right
Obverse legend: illegible
Reverse: Aquila between two standards
Reverse legend: LEG XIX
Dated: 32.0 to 31.0
Weight (g): 2.87
Diameter (mm): 16.6
Thickness (mm): 1.7
Completeness: Complete
Parish: Fenwick
District: Doncaster
County: Doncaster
Region: Yorkshire and the Humber
Discovery method: Metal detector