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.
1981 Postal Card - Non-denom Eagle
1981 20c Stamped Envelopes and Wrappers - Capital Dome
20c brown 1981
1995 $3 Space Shuttle 'Challenger', Priority Mail
1993 $2.90 Space Shuttle, Priority Mail
1973 6c Postal Card - Liberty
1978 15c on 16c Stamped Envelopes and Wrappers - Surcharged
1988 $8.75 Eagle and Moon, Express Mail
1991 Postal S. Non-Profit
Stamped Envelopes