Sarny. 1942, inverted red overprint ''GK.-Ssarny'' on 50k black, type I, printed on reverse side of dark blue paper (not glazed), no gum as issued, NH, VF and rare, only 15 stamps with double error possible, G. Krischke certificate, C.v. €3,500 (Image)

Sarny. 1942, inverted red overprint ''GK.-Ssarny'' on 50k black, type II, bottom sheet margin single, printed on reverse side of dark blue paper (not glazed), no gum as issued, NH, VF and extremely rare, only 7 stamps of type II possible with double error, Z. Mikulski certificate, C.v. €5,250 (Image)

Sarny. 1941, red overprint ''GK.-Ssarny'' on 3krb black, printed on light gray paper with black bars on reverse, basic stamp of type II, no gum as issued, NH, VF, G. Krischke certificate, C.v. €525 (Image)