Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1246:
1956, Ivan M. Sechenov, Russian Physiologist, 40k multicolored, perforation L12½ instead of comb 12×12½, unfolded block of four, full OG NH, VF, block with comb perf is included, Est. $75-$100 , Sc. #1826 var
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