(World Congress of Esperantists) Oka Kongreso Esperantista. Krakovo 1912.
Rectangular-shaped stamp, in white-black-green, with an image of the letter "K" in a crown and a star above, with the inscription as above. Signed "STER." Dimensions: 4 x 2.9 cm.
Good condition, glue mark and handwritten numbering on the back. 8921/171
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