COIN (ROMAN)
A corroded Roman copper-alloy dupondius, probably a contemporary copy of Augustus (27 BC-AD 14), dating to the period c.18-17 BC (Reece period 1). Obverse: AVGVT/TRIBV/POT, legend in three lines in oak-wreath. Reverse: [...L?]O II(I)[...], large S C. Prototype of the mint of Rome. 

This is probably a contemporary copy of a dupondius of Augustus, the obverse legend abbreviated from the usual AVGVSTVS TRIBVNIC POTEST. The moneyer's name in the reverse legend is not clear, but perhaps ends [...]O III for P. Licinius Stolo or similar, cf. RIC I (2nd ed.) nos. 346-347
Ruler: Augustus
Denomination: Dupondius
Material: Copper alloy
Mint: Rome
Mintmark: -//-
Obverse: Legend in three lines in oak-wreath.
Obverse legend: AVGVT/TRIBV/POT
Reverse: S C
Reverse legend: [...L?]O II(I)[...]
Dated: -18.0 to 14.0
Weight (g): 5.4
Diameter (mm): 24.0
Completeness: Complete
Parish: Frilford
District: Vale of White Horse
County: Oxfordshire
Region: South East
Discovery method: Metal detector
Notes: Recorded from details emailed by the finder.