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

Worldwide Air Post Stamps and Postal History - Bolivia

The auction will start in __ days and __ hours

Start price: $100

Buyer's premium:

1924, National Aviation School, 10c-5b, complete set of seven, diagonal red violet overprint ”Specimen”, full OG, mainly LH, F/VF, Est. $150-$200 , Sc. #C1-7