I have a snap on bezel on my 12s Waltham. It's an open face. It's missing the crystal. I have a few crystals and pretty sure I've narrowed it down to the correct size. I was thinking of taking it down to my watch guy to pop the new glass in as I can't seem to heat the bezel up with any primitive measure I have. Anyway, I was looking very closely at the edges of the lip and there is a section that looks a little worn and am wandering if the new glass will even seat. So preparing myself to maybe have to find another bezel. I measured the outside at 42.5mm. When I look at bezels on the bay, but i don't see any in .5 increments. Just whole numbers. Should I be measuring in a different location?
The first pic is the good side. 2nd pic is the bad side.