The bottom portion of the letter appears to have been written and signed by Dan Montgomery, "Received the contents of the above order in full" and signature appear different than the handwriting of the original order. As Ron said, apparently signing for receipt of his pay. Whether the other commissioners, Antes and Espy each signed separately after one wrote the letter not as clear. I believe it is possible this was written by someone other than Antes, his brother, and Espy, and was addressed TO them, to pay Montgomery. "To Fredk Antes, Esq, Treasurer} Wm Antes, James Espy, Commissioners}" Or is it written by William to his brother Fred and then signed by William? Unclear. Very cool to see, however! Thanks for posting this.