Maximinus II as Caesar. Silver argenteus. AD 305-308. Silver argenteus (3.47 g). Serdica, 305-306 AD. 

MAXIMINVS NOB C, head laureate right.
VIRTVS MILITVM, three-turreted camp gate, arch open, no doors.

Mintmark dot SM dot SD Delta dot.

RIC 22; Cohen 206

With permission of Gemini IV Auction, lot 507, Jan 2008.