Went to CZ-USA pages
and they had no models below the 70's. How do I find info on the 52?
The CZ-52 ended production somewhere around 1970, and was never offered commercially as far as I know. That is probably why the CZ page makes no mention of it. Here is a page with a brief review of the pistol:
http://www.the-man-page.com/cz_52.htm