Fantastic find! It's most likely a 952-1 if it definitely has the pivoting grip safety. On this pistol, the hammer will fall no matter what the grip safety is doing, but the grip safety deactivates an internal firing pin lock.

These pistols are exquisite. It will look much like your prized 52-2 but everything feels different when the hammer falls. The Model 52 is quite sublime with the low-pressure wadcutter round. The 9mm is running twice the pressure, and that blast makes the 952 an entirely different experience to shoot.

The magazines aren't hard to find, they are the 9-shot single stack magazines, same as the 3904/3906/909.

Price-wise, you did fine. You may notice that many 952's go for more money on Gunbroker, but the ones that bring bigger cash usually have the original aluminum PC case and original paperwork.