Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 429:
1937, Mufti issue, large die proof of 3c in bright carmine on India paper placed on sunken die large card, imprint at bottom reads: ”H.M. King George VI. X-G-649. Canadian Banknote Company, Limited”, proof size 80x87mm, fresh, VF and rare, NSSC 194 dp8, C.v. US$1,200, Est. $800-$1,000, Scott #233
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