Winning bid: US $31.50 
Seller ancientauctionhouse.com
Ended Jul-11-2003

Description - legends and attribution corrected.

Severus Alexander AD 222-235 Silver Denarius 

Obv: IMP C M AVR SEV ALEXAND AVG - Laureate head right 
Rev: PERPETVITATI AVG - Perpetuitas standing left, leaning on column, legs crossed, holding a globe and scepter 
Rome mint: 

RIC IVii, 169, rated Scarce