Looking over the Revolutionary War pension file of James Smith and Margaret Truax Smith, I see a few more historical gems to share. One document dated 12 February 1835 appears to include James' signature (see below). This one transferred the administration of his pension from Kentucky to Indiana.
Source: Fold3, page 36.
Andrew Smith, son of James and Margaret, and Stephen Daugherty (son-in-law through his marriage to their daughter Jane Smith) appeared before the Justice of the Peace and testified that they knew James to be the same person who had originally applied for the pension in Kentucky. Stephen and Jane Smith Daugherty testified on behalf of Margaret on 13 July 1843 as part of her widow's pension application. This document also includes Margaret's mark for her signature.