fabrica de itajuba rv45 m917 mine has a four digit S serial number?
The 1937 guns mostly have flat-top frames and square-notch rear sight channels, but the 1946 guns, which were made up from early-'20s parts that the company reacquired from the government, have rounded-top frames with a round-notch sight channel. And there are a very few postwar new-production non-export 1917s, some of which have S-prefix serial numbers. For some reason I suspect one of these might appeal to you if you could come across it at a decent price.

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