1, 50 Karbowanez control mark with dark purple red typography overprint "GK. Ssarny", complete sheet with 25 values, 11 values in type I, 9 stamps in type II, the types IV, V, VII, IX and X, as well the overprint flaw II "comma instead of dot to GK, field 24", unused without gum - as issued, very fine, from this value were about 22 sheet printed, signed multiple times, expertise Robert Brunel VP (2025) "the condition is perfect", Michel 3.750.- plus