While much has been covered about the history of the El Primero movement (in https://v.gd/5VmTwR link this very story!), it's important to discuss the caliber 3600 beating away inside this watch. For one thing, it's visible https://is.gd/OkZIip link through an exhibition caseback. While it's a brand-new movement it is effectively an updated version of the caliber 400 https://zzb.bz/2tFAoe link from 1969.

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