Have my Dad’s Mk I, circa 1955.
FWIW I acquired an Erma RX-22, a .22 copy of the Walther PPK. Fun to shoot & a good subcaliber stand-in for my Makarov & P-64. Not expensive, either.
I have one of those Erma’s but mine doesn’t work anymore. It was cheap but worked fine. I got it used and the slide was pretty scratched up.
I hit upon an idea. I spray painted the slide with Krylon and then had a brilliant idea. I figured it would be better to bake the finish on.
I put it in my gas grill and maybe 15-20 minutes later took it out. To my surprise, the slide was warped. I have thought of ordering just the slide from Numrich etc. but never got around to it. I still have the bottom part or I guess they call it the frame.