Official SIPEX First Day Cover 1966 Block of Stamps

ENTERING HIXIS PHILATELIC WASHINGTON, DC. 66 TH Official SIPEX , EXHIBITION 54 Art Craft AUTHORIZED BY SIXTH INTERNATIONAL PHILATELIC EXHIBITION US WAS MAYOR 21 1966 DC US Sixth International Philatelis Exhibitions Washington DC. 20008 First Day Cover Judson & Lindsey 200 FIRS DB Sixth International Philatelic Exhibition Washington DC. 20008 4364 N. Nelson Her. Peoria Ill 51 US Sixth International Philatelic Exhibition Washington DC. 20008 DLL US Sirth International Philatelic Exhibition Washington D.C. 20008