Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 394:
1935, large die proof of 5c in blue on India paper, mounted on sunken card, No. XG-603 at the top, proof size 97x97mm, card size 230x153mm, perfect quality, VF and scarce, NSSC #185dp2, C.v. US$900, Scott #221
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