Hey guys,
just wanted to let you know, that this (old

) thread was really helpful. I was also looking for an original crystal for my 3647 without success (or lets say I didn't want to pay 400 Euros

). In the end I read this thread and I got myself a Robur 326 with tension ring. It fits perfectly and if you can live with the different form (see difference below) its the best solution I think

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