1, 50 Karbowanez with overprint "GK-Ssarny" in Type I, block position 7, proper franking single stamp on a letter with arrival postmark "Sarni -a- 29 11 41", envelope folded multiple times - the stamp has a vertical crease in the right part, photo certificate Gerhard Krischke BPP "The letter is properly franked and also used. Letters of this type are very rare."