Bidspirit auction | British Commonwealth - Batum

British Commonwealth - Batum - 1919, black overprint ''Batum. Ob.'' over black surcharge 10k on 7k light blue, nicely centered, intact perforation, full OG, LH, VF, Romeko and J. Stolow guarantee hs, PF certificate, C.v. $975, SG #10, £800 , Sc. #10