Bidspirit auction | One Man Collection of Tannu

One Man Collection of Tannu Tuva - Second Air Post issue - 1937 (February 9), large size registered cover to USA, franked by six stamps, including 10k, 50k and 75k from the 2nd air post set, tied by black Kyzyl letter ''c'' postal markings (Ustinovsky No.3.3), NYC ''3-5.1937'' arrival ds on reverse, mostly VF, Est. $150-$200, Scott #C11, C14‑15