1919: First Issue 5 r. black & blue, good to large margins all round, used on reverse of 1920 registered cover to Moscow tied by BAKU
1919: First Issue 5 r. black & blue, good to large margins all round, used on reverse of 1920 registered cover to Moscow tied by BAKU cds (Oct 10) in black, with Moscow arrival adjacent and registration label on obverse. Signed Mikulski.
