After adoption of the M1911A1 in the United States, the Argentine government purchased the pistol from Colt as the Model 1927. The order to Colt was for a run of 10,000 guns for the Argentine Army. These guns were serial numbered in their own range from 1 to 10000. The original finish of these guns was blued with a brush blue finish and they had checkered walnut grips. The way to recognize them is that on the right side of the slide it has the following markings:
Colt CAL. 45 MOD. 1927 S/N
In the 1930’s, the Argentines secured license to manufacture their own .45s. These are called "Sistema Colt" to distinguish them from the actual Colt Modelo 1927. These Model 1927s were made by Fabrica Militar de Armas Portatiles "Domingo Matheu," in Rosario, Argentina. They are marked "F.M.A.P" or "D.G.F.M. (F.M.A.P)" on the left side of the slide and "Ejercito Argentino, Sist. Colt, cal. 11.25 m.m. MOD 1927" in two lines on the right. All Model 1927s bear the Argentine seal on the slide.
An estimated 38,000 copies of the Colt M1911 .45 caliber pistol were made at Rosario; another 75,000 were produced in 1947-1966 (some of which were still in service with elements of the Argentine military during the Falklands/Malvinas war in 1982).
All Sistemas were originally blued, except a few that were specially ordered for the Navy. Early guns had checkered walnut stocks, later had black or brown hard rubber. They were numbered on the frame, slide, barrel, and magazine. Most examples noted have been either reblued, or phosphated; many of the phosphated examples have blued small parts.
In addition to military production, the firm of Hispano Argentino Fabrica de Automoviles. SA (HAFDASA), manufactured an unlicensed copy of the Colt known as the "Ballester-Molina." Most features of the HAFDASA gun are taken directly from the Colt product. The trigger and trigger linkage differ, however, in that the trigger pivots, and the trigger extension is external. The Ballester-Molinas also lack the grip safety. The story that the Ballester-Molinas are made from steel from the German battleship Graf Spee is a delightful but false legend. Both the Model 1927 and the HAFDASA .45s are extremely well-made pistols.
Understand but they really don't exactly fit in USGI... more likely should fit in Import or Contract guns or something more like that. But, lacking anything better I guess thats the right place to stick em.
But... what the heck! I woulda never looked there and should have I guess.