50 Kopeks definitives, two values, one with "printed on rough back of paper" variety, both type I, cancelled "Sarny -a- 27 11 41" on piece, extremely rare, signed Krischke BPP and others, expert opinion Walter Zirath BPP (2025) "...of which only approx. 15 type I examples are known. The condition is faultless...", Mi. 2.660.-