Logoysk, 6 roubles surcharge

Size 17,5 x 23,7 mm. Enlarge image
Double surcharged in black at left of stamp on USSR postal stationary envelopes
6 r + 6 r on 4 k (1976)
6 r + 6 r on 5 k (1982)
6 r + 6 r on 5 k (1988)
Period of use: from September (?) to October (?) 1993

© Yuri Vasiliev