Libya 1969 African Tourism imperf. progressive proofs on two pages from the Courvoisier archive, 6-stage progressive proofs the 15m (4 sets in different colours, of which 3 were unadopted and cancelled by red pen line) and 30m (2 sets in different colours of which 1 was unadopted and cancelled by red pen line), ex Courvoisier Archive (36) Dealer David Feldman S. A. Geneva Auction Minimum Bid: 550.00 EUR (via Philasearch.com: David Feldman Specialised auction: Airmails & Middle East - item 9346-A177-21328)
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