Not 1952 as I read the 3" guns weren't introduced until 1955.
Measure the length of pull to see if the stock was cut for the recoil pad. The LOP would be the distance from the face of the trigger, and in this case , to the rear of the stock center not including the recoil pad. The correct LOP on a Superposed is 14.25 with or without a recoil pad.
The choke designations should be marked on the side of the chamber's below the ejectors on the left hand side when you open the barrels.
* Full
*_ improved modified
** modified
**_ improved cylinder
Post the serial number and perhaps we can help you out.. Hopefully your not in the 1966 -1972 salt wood problem range.
Appears you have a post 1970 gun as it has the full pistol grip, long tang and flat knob that was introduced 1970 - 71 so a check for the salt wood is advisable.