DGFM is not an actual Colt made by Colt, but a licensed copy made by the Argentinians. Those numbers will all match, frame, slide, barrel. FMAP is the name of the Argentine company that made licensed copies.
DGFM: Dirección General de Fabricaciones Militares (General Directorate of Military Industries; Argentina)
"In 1945, after construction of the state-owned "Fabrica Militar de Armas Portatiles" (F.M.A.P.), Small Arms Factory in Rosario, Santa Fe (250 miles from Buenos Aires), assembly of Sistemas was transferred to the new plant and another 88,494 pistols were produced through 1966".