City Commemorative AE3. 332-333 AD. 

Obv: VRBS ROMA, visored, crested helmeted bust of Roma left in imperial cloak 
Rev: she-wolf suckling Romulus & Remus, two stars above
Mintmark star PLG. 

RIC VII Rome 267, rated R3

Contributed by online store of the Forum Ancient Coins, August, 2008.