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Hi tritto,
ALL calibre 4006 Bell-Matic models share the 325T02AN crystal. The only Bell-Matic models that do use a different crystal (325T04AN) are the rare calibre 4005 date-only watches.
The SK crystals as mentioned by Mike have a different profile and sometimes are hard to fit, but should do the job. If the tension ring is ok, you could also purchase a NOS one with a gold ring and swap it with the one you have currently installed in your Belle.
Good luck and let us know how it turns out
Best
Hermann
ALL calibre 4006 Bell-Matic models share the 325T02AN crystal. The only Bell-Matic models that do use a different crystal (325T04AN) are the rare calibre 4005 date-only watches.
The SK crystals as mentioned by Mike have a different profile and sometimes are hard to fit, but should do the job. If the tension ring is ok, you could also purchase a NOS one with a gold ring and swap it with the one you have currently installed in your Belle.
Good luck and let us know how it turns out
Best
Hermann
