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Russia

postage

1957, Apr 17 Leonhard Euler 250th issue unwmk p. 12

X

40k

multi

Leonhard Euler

German Democratic Republic

1983, Sep 6 200. Anniversary Of Leonhard Euler issue (no perf info)

-

20pf

blk & bl

Leonhard Euler

Switzerland

semipostal

1957, Nov 30 Pro Juventute 1957 issue

-

5+5

Leonhard Euler

1 to 3 of 3