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Stamp World London 90 was an international stamp exhibition held 1-13 May 1990 at the Alexandra Palace, London.
1990 was also the 150th anniversary of the introduction of the Uniform Penny Post and the Penny Black and a number of stamps and exhibition souvenirs were produced in that connection.
Palmares
The Grand Prix went to the following exhibits:
The FIP Medal was awarded to Gary S. Ryan for his monograph "The Cancellations of Hungarian Post Offices on the First Issue of Hungary 1867-1871".
References
Stamp World London 1990 Wikipedia(Text) CC BY-SA