Bidspirit auction | One Man Collection of Tannu

One Man Collection of Tannu Tuva - First Air Post issue - 1934, imperforate trial color proofs of 5k, 15k and 50k, all are in carmine (for 15k - issued color), full OG, NH, VF and very rare, Est. $2,500-$3,000 , Scott #C2, C4, C6