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Montblanc

Well...

 


Well, the Dubois Depraz is the most commonly used perpetual calendar module in the industry. Therefor I don't see a custom module here. I also doubt that the combination of the SW300 (mass production) and this module will be exclusive to Montblanc as the module was conceived by Dubois Depraz to fit the ETA 2892-A2 or its clone, the SW300. The list of brands which used this combo (with ETA 2892) in the past is huge, like Bucherer, Movado, Kelek, Nivrel, Frederique Constant, etc.

Best,

Goldenlutin

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