Dear Faldage: Double D'uh. Post Office wasn't founded until good bit after Revolution.

Joke on me.
The first American postal service was established in the colony of Massachusetts in 1639. From 1707 until the year before the American Revolution, the General Post Office in London controlled the postal service in America. In 1775 the Continental Congress resolved to have a postal system of its own, and Benjamin Franklin was elected to carry on the work. When a postal service was authorized by Congress in 1789 under the U.S. Constitution, the nation had 75 local post offices, and the mails were carried over 1875 mi (more than 3000 km) of postal routes.



"Postal Service, United States," Microsoft(R) Encarta(R) 98 Encyclopedia. (c) 1993-1997 Microsoft Corporation. All rights reserved.

But I remain unconvinced that any Queens pictures were on first stamps. Not sure of date of that.