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

Worldwide Air Post Stamps and Postal History - Colombia

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Start price: $150

Buyer's premium:

1923, ”Bo” overprints on 5c-5p and over red ”R” on 20c for Bolivian Air Post correspondences, complete set of 12, usual dry gum, LH or hinged, mostly VF and scarce, only 50 complete sets possible, each stamp with E. Kessler or Sanabria guarantee hs, C.v. $492.50, Est. $250 -$300, Sc. #CLBO1-11, CFLBO1