A stamped envelope or postal stationery envelope (PSE) is an envelope with a printed or embossed indicium indicating the prepayment of postage. It is a form of postal stationery, and a neat addition to any stamp collection.
1940 6c Stamped Envelopes and Wrappers - blue
1971 6c + (2c) Stamped Envelopes and Wrappers - light green
1968 6c Stamped Envelopes and Wrappers - light green
1971 6c + (2c) Stamped Envelopes and Wrappers - light blue
1974 10c Stamped Envelopes and Wrappers - yellow, bright blue & light green
1992 Disabled Americans
1971 60c Special Delivery
1994 29c Football
1995 32c Space Station
Stamped Envelopes