I have 7 - 4.5"x 6.25" cards with stamps and postmark announcing the grand opening of the new Braintrre, Ma. Post Office in 1993. The stamp honoring Sylvanus Thayer, a Braintree native is from the series of Great American stamps. The history of Sylvanus Thayer is printed on the back. I also have a commemorative post card dedicating the 911 Memorial Garden Walkway at the Brockton Post Office in 2003. Asking $5 ea.