Bidspirit auction | One Man Collection of Tannu

One Man Collection of Tannu Tuva - First Air Post issue - 1934, Argali and Airplane, two trial color perforated proofs of 25k in red violet and black, affixed over brownish gray cardboard (large Project card cut into pieces), intact perforation, VF and very rare, Est. $1,500-$1,800 , Scott #C5