Russia RSFSR 1922 12 german marks GM Consular duty Overprint Airmail Signed MH 15525 On back side black color guarantee of Soviet Philatelic association 12 German Marks Type 4 Pos 9 Type 4 occurs 2 times in sheet of 25 stamps See image of types Zag SI 5 Zv C1 Sc CO1 Mi 1IV