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Likely about early 1977 for a number like yours. Does it look like there's a discoloration spot on the lower left side of the slide... about in the middle?
Parts could be tough to find, depending on the part. New recoil springs can be had online from Victory Arms at victoryarms.com
An Officer's mag will likely work, but it will stick out the bottom of the frame a little.
Hope this helps,
Deeton