Welcome to the Forum from Virginia.
Like already posted your Model 39-2 can have the manufacture date estimated by knowing the complete serial number after the A prefix.
The A prefix serial numbers run from A115001 (1970) to A875000 (1984). The last Model 39-2 was shipped on February 15, 1983 and was serial number A747148, so there is your "range" (1970 to 1983.
SCSW 4th Edition does break down the serial numbers into year(s) so again...if you want to share your serial number, we can pin it down to at least a year made.
Mine is pictured below and was made sometime in 1977, as the 1977 serial numbers started with A385001, and 1978 s/n started with A475001. This info all comes from SCSW 4th, a very good reference book if you are planning more delving into S&W firearms.
Like posted above, if you need to look for spare mags, pursue only the factory originals, they are pricey these days, but aftermarket mags just don't seem to work reliably in the 39-2.
Enjoy yours and let us know if we can assist you further with dating your gun.
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Charlie B
SWCA#3083, SWHF#570
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