Does anyone out there know who manufactured slides for the 52 other than smith? I recently purchased one that is very roughly machined but has a 9mm breech face.
Nope definitely a 52 spent a couple hrs lapping the slide to the frame. Fit it with an old 52 barrel that was sleeved to 9mm. Installed a 9mm extractor. Was worried how it would cycle but worked flawlessly with 158gr swc with gas check and2.7 bullseye. Groups were 1 1/2" at 50 ft. If I can get the groups a bit smaller I'll polish it and send it to be blued. Slide was definitely in the raw with no roll marks but everything fit well with 52 parts.
S&W did some as an experiment. I had a 52 with a slide that had machining marks, a 52 rear sight and front sight. Also had 3 9MM barrels and a 38 super barrel. I posted pictures of it here when I acquired it and when I listed it for sale. You could probably research it back.
A friend has a Model 52 that belonged to the Illinois SP. Their armorer fitted Model 39 slides and barrel to the 52's. I posted pictures of the 52 & 39 slides and pistol along with the corroborating paperwork for them a couple of years ago here.