Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 924:
Description
1905-07, nine perforated (2) and imperforate proofs on white wove paper, perforated in dark and pale brown, imperforate – yellow, gray, green and gray rose (block of four), no gum as issued, VF, C.v. $430, Est. $300-$350 , Schmidt #55/68
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