United Arab Emirates 1979 Gulf Postal Congress imperf. proofs on a page from the Courvoisier archive, with 5-stage progressive proofs of the 50f & 5D, ex Courvoisier Archive (10) Dealer David Feldman S. A. Geneva Auction Minimum Bid: 950.00 EUR (via Philasearch.com: David Feldman Specialised auction: Airmails & Middle East - item 9346-A177-21444)
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