The imprinted stamp on postal stationery may contribute to a topical collection.
U.S. 1974 envelope.
Other design elements on postal stationery may enhance a thematicl collection.
USSR envelope. How about postal stationery on postal stationery for a theme?
Poland. postal card. Kopernicus
Norway. 1999. postal card with fish oil capsule. It is difficult to mount in an album as the plastic holder is 1/2" thick. Also does not pass through the postal machines very well without cracking.
Front cover of first day ceremony program for U.S. 1990 postal card.
inside of first day ceremony program includes the postal card with first day cancellation.