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A complete Raman and X-ray fluorescence study on the Spanish 15 cents stamp from the King Alfonso XIII (1889–1901) issue with colour error is presented. Even though this fact has been known since 1890, there is no record of such error in any catalogue. The number of printed stamps was around 1300million, and it is believed that around 4000 stamps were printed with colour error, but less than 100 stamps...
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