Please consider donating to help offset our high running costs.
Uhhhh, what kind of watch would help us to help you! Pics of the case maybe, too.
Guessing it's something from the 60s? My Seamaster crystal ring snaps into place in a similar fashion. I had a moncoque Cosmic that was a bit more involved.
Can you post a photo of the top side of the bezel?
I have a number of Omegas with removable bezels and they use a plain compression crystal which is I suspect is what you need as well.