What watch do you have - and does it have display or closed case back? If closed I think you can just tuck basically any 6497 in there, asian versions start around $35. ETA/Unitas versions often sell without Panerai engravings etc from e.g Ofrei, very good choices though of course. If you have an open back, you should be able to nag a replacement from your TD of choice. If it's a 111, w0lf currently have some nice ones in the sales subsection here.