"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 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)
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