I've owned a 39 and several 39-2s since the '60s. To the best of my recollection, the change happened around serial number 150,000. I don't remember now what year this occurred. Apparently, there were reports of the soldered-together/brazed? bushing seperating from the stress of the recoil spring bearing on it. I never had an earlier style bushing break, but having the slide retain the recoil spring and going to the one piece bushing seemed like a good idea to me.
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NRA Life, COTEP 640
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