STAMP COLLECTING #1474 Block of 4 x 8 cents US Postage Stamps" width=w height=h />In 1997 the first triangle stamps were issued by the USPS, to commemorate San Francisco's Pacific 97 Stamp Exhibition. The stamps feature a mid-19th century clipper ship and a U.S. mail stagecoach - both of which are historically associated with mail delivery in California. The ship design is based on an advertising card for the clipper ship Richard S. Ely, by American Harrison Eastman (1823-1886), who was the probable source for the U.S. mail stagecoach design.
- Stagecoach
- Clipper ship "Richard S. Ely"
- Harrison Eastman (stamp designer)