Machodoc
Old Guy
With these new pics, I withdraw my original opinion. Looks like this could be a 1925 Commerical purchase. Originally, it would have been blued...must have been parkerized when it was refinished.
Depending upon which list you look at, it was either made in 1925 or 1926. A more detailed list (posted earlier--#38) appears on an Argentine website. It shows this one as having been made by Colt in 1925, and gives production numbers for the ones shipped to the Argentine Navy. Someone noted that the information was, "straight out of Clawson," so we don't know if the site and Clawson used the same original info source, or if they copied Clawson's data.
In any case, this gun was part of an Argentine government contract with Colt. They apparently bought the commercial "Government Model" Colts at various times between 1914 and 1950, with their largest purchase being the 10K "Hartford Colts" order of 1927.