Bidspirit auction | One Man Collection of Tannu

One Man Collection of Tannu Tuva - First Air Post issue - 1934, Argali and Airplane, 25k black violet, block of four triangle stamps, right pair perforated at top and bottom only (imperf vertically and diagonally between stamps), full OG, LH, VF and rare error, Est. $400-$500 , Scott #C5 var