FIPEX

FIPEX - see Fifth International Philatelic Exhibition.
First Bureau Issue - see Series of 1894.

Fifth International Philatelic Exhibition (FIPEX) - The Fifth International Philatelic Exhibition was held in New York, April 28 to May 5, 1956.

3¢ & 8¢ FIPEX Souvenir Sheet Fifth International Philatelic Exhibition
1.35
1076 ...

Certainly the 1936, 1947, and 1956 souvenir sheets for TIPEX (Third International Stamp Exhibition) CIPEX (Centennial International Stamp Exhibition) and FIPEX (Fifth International Stamp Exhibition) qualify as setenants, if we allow souvenir sheets.