Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 745:
1906, View of Mostar, trial color proofs of 2h, left sheet margin single in dark violet, imperf vertically and two imperforated blocks of four in lilac and black, all printed on wove paper, full OG (block in lilac) or no gum as produced, VF, Est. $100-$150, Sc. # 31
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