Fine Coins & Stamps
Lot 956:
1955-56, three FD covers commemorating Scientists, Aleksandr Popov (November 5, 1955), Ivan Kulibin (May 10, 1956), Ivan Sechenov (June 15, 1956), two last ones are addressed with arrival hs on reverse, mostly VF, Sc. #1759-60, 1804, 1826
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