1,50 Karbowanez overprinted "GK-Ssarny" type I, sheet position 7, correct-rate single franking on cover with arrival mark "Sarni -a- 29 11 41", envelope folded several times - stamp affected at right by vertical crease, photo certificate Gerhard Krischke BPP "The cover is correctly franked and has been postally used. Commercial covers of this kind are very rare."