21c Air Mail Stamp Series of 1971 Block of Stamps

FIRST DAY OF ISSUE FIRST AIR EXPRESS SHIPMENT FLOWN IN WRIGHT BIPLANE, NOVEMBER 7, 1910, BY PHILLIP O. PARMALEE, FROM DAYTON TO COLUMBUS, OHIO MAY. 21 1971 DC Air Mail Stamps Sundard Art Craft SERIES OF 1971 USA USA ² UNITED STATES AIR MAIL UNITED STATES AIR MAIL FIRST DAY OF ISSUE CCCCCCCC 21¢ USA USA ² UNITED STATES AIR MAIL UNITED STATES AIR MAIL 4314 Nelson Des Peoria Gee