I acquired this with a collection of covers in 2007 I am now going through. The addressee, Brigadier General Thomas Jesup served as US Quartermaster General from 1808 to 1860! So that is historically accurate. And the hand writing of the writer and the receipt annotation are different. However, the WM on the paper is Old Hampshire Bond, which was first available in 1889. So it is a forgery or a copy of the original. One wonders why someone would do that.