Two sticky triangles -[ HMM ]-

The first triangular stamps ever offered in the USA, released by the United States Postal Service in 1997 for the Pacific 97 philatelic exhibition. The stamps were issued to commemorate the 150th anniversary of postage stamps in the US.

 

I didn't specifically purchase the stamps to collect; I used up all except the last four stamps, which I saved for posterity. That was my habit up until Internet bill pay and e-mail put an end to sending traditional stamped mail.

 

The cropped width of this photo is right at the 3-inch (76.2mm) maximum.

Done