Watch List notes:

ROMAN EMPIRE: Augustus, 27 BC - 14 AD, AE as (5.78g), Rome, RIC-431; BMC-226, countermark IMP (in ligature) in rectangular incuse, on reverse of as struck 7 BC, Salvius Otho moneyer, bare head of Augustus right, CAESAR AVGVST PONT MAX TRIBVNEC POT // M SALVIVS OTHO III VIR A A A F F around large S C, VF on F host. This type of countermark (by imperial authority) allows a coin minted in Rome or Lugdunum to be used legally in a province by the local Roman legions. The area usually concerned was the German frontier, along the Rhine, during the wars of the first two decades AD.

Estimate: 75-100 USD