Mark Cloke has posted my article on the Marine M1859 sergeants sword on his Old Swords site (https://oldswords.com/images/Marine Sergeant.pdf). This study of the M1859 Marine sergeant’s sword is a revision of my article first published in the October 2018 edition of “Man-at-Arms” magazine. It includes additional information developed since that time, but the most significant change is a re-evaluation of when the Marines first added the initials “U.S.M.C.” to the blades of their sergeants’ swords. The conventional thought is the change was made in 1875; my analysis of the data suggests a much earlier date. If any readers have thought on the matter or can address some of the questions posed at the end of the article, I would welcome your input.