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France

postage

1963, Apr 27 famous Europeans unwmk p. 13

-

30c

multi

Hugo de Groot

Netherlands

2021, Mar 23 (no wmk info) (no perf info)

-

1

gld & blk

Hugo de Groot

—

—

semipostal

1947, Aug 1 summer 1947 issue wmk. circles p. 12.5x12

-

20+5c

bl

Hugo de Groot

1 to 3 of 3