Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - 1927, The Hague Air Post Conference, 10k and 15k, complete set of two, plus stamp of 10k with broken ''7'' of ''1927'', full OG, VLH, mostly VF, Est. $150-$200 , Scott #C10-11, var