C Posts 39 Likes 5 CK90s ·Apr 6, 2025 Hi, I'm fairly new to this. I'm curious as to why the omega crystal has a recess on the outside of the crystal. It's a tension ring and I believe it's original. I drew a rough idea of the crystal in the last picture.
Posts 17,608 Likes 36,828 JimInOz ·Apr 6, 2025·Melbourne Australia It may be to allow the crystal tool to grip the crystal for removal. The watch must be opened from the front with Tool 107.