Looking for some help with a 1951 G6232 case....maybe.

I came across this watch as one of a couple in a trade a couple of years ago. Just kind of put it aside and just now looking into it. It is a solid 14k case with the 12 point screw on back. I think it is a G6232 case and maybe 342 movement. Watch looks great and as of the last two days, keeping great time. So.....how do I find the tool needed to remove the back? My watch maker did not want to try with the spanner tool and they do not have this tool needed.
I just want to know for sure the case and movement info. I was told in the trade that it had a service not long before that time of the deal.
I know, pics to follow.....

Bump......