Maximinus II, as Caesar. (AD 305-308). AR argenteus (3.46 g. Serdica, Struck AD 306–307. 

Laureate head right.
VIRTVS MILITVM, three-turreted camp gate, arch open, 
no doors.
Mintmark dot SM dot SD Delta dot.

RIC 22; RSC 206.
 
With permission of Freeman & Sear Mail Bid Sale 12, lot 629, Oct 2005.