"Philip Ferrari de La Renotière (January 11, 1850 – May 20, 1917) was a noted stamp collector, assembling probably the most complete worldwide collection that ever ...
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existed, or is likely to exist. Amongst his extremely rare stamps were the unique Treskilling Yellow of Sweden and the 1856 one-cent "Black on Magenta" of British Guiana." - (en.wikipedia.org 06.06.2021)
