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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1953, Ministry of the Communications Building, 5c/8c- 15c/20c, set of three surcharged values, each one has double surcharge, full OG, NH, VF, each one with F. Kessler guarantee hs on reverse , Sc. #C227-29 var