UNITED STATES 1877 Airmail. 5c. "Buffalo Balloon" dark blue. One of the prepared 300 official seed samples to supplement the regular postal franking letters transported from Nashville to Gallatin (Tennessee), the balloon "Buffalo". Finaziario Bolaffi, Philatelic Foundation MH.....(Sc. CL1)

Estimate € 3,000 - 3,500

Sold € 3,800