Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

United States - Air Post stamps

The auction will start in __ days and __ hours

Start price: $350

Buyer's premium:

1985, Lawrence and Elmer Sperry, 39c multi, bottom margin vertical imperforated pair, full OG, NH, VF and rare, according to Scott Errors Cat. only 25 pairs reported, C.v. $1,250, Est. $600-$700 , Sc. #C114a