The original magazines were stainless with a flat stainless baseplate. These are very difficult to find nowadays. One option is to use magazines for the 39, 39-2, 439. Same magazine as the 639 but made out of blued carbon steel. These are still fairly easy to find and usually not that expensive. I have seen the stainless 639 magazines go for as much as $65 each when you can find them.
The magazines with the plastic baseplate are made for 3rd generation Smith's but will work in a 639. Just my opinion, but I don't care for the way the plastic baseplates extend beyond the frame.
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