I've seen a few of the Tremont House pieces on auction house catalogs and all of the ones I actually did follow fared very well. I was offered $1,100.00 USD a few months back by a local collector which is basically 1.5 times it's catalog value (2009 Scott $750.00)and although it was tough to do, I had to turn him down for fear that I might not ever own another. Some pieces you just can't put a dollar value to.
*Answer to Donna* Both, It technically is a coin and was designed to purchase goods with. Stamps on their own were not made to be handled, hence the encasing. Here is a bit more regarding the use of Postage stamps as currency.
http://www.historyconfidential.com/...egal-tender/