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Slide is matching with the frame. Both have the same serial numbers. But yes also sold to Argentina like many during the year 1933 then imported back to the US with additional barrel and slide numbers.
The 4-Digit is not the serial number. It is more of a unit count for the Argentine government. Older Colts have the serial number inside of the slide in the firing pin housing. That number along with the frame number is the serial number.