Thanks alligoat. I have ordered some new crown gasket as well. I will replace the crown gasket and dry out the watch before sealing it back up. I glued in the crystal quite well, so maybe I will get a pressure test after that. I have a set of calipers, so knowing the measurements of the different crystals will save me from having to just buy a bunch to try them out. The 25-123 is designed for a 34mm tudor and has the date window in the correct place. There is also the 25-141 and 25-125 and possibly others.