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Type: stamp Issuer: Czechoslovakia Date: 1987 Denom: ? Visibility: public Image owner: none Crops No visible images cropped from this one. Measurements Resolution is unknown. Source Source name: Colnect File URL: http://i.colnect.net/b/3793/769/Prague-Town-Hall-mathematical-clock-Theory-of-Functions-dia.jpg Uploaded April 21, 2017, 8:40 pm by Stan Shebs