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Watchuwant is now WatchBox! Subscribe for the best luxury watch content. Tim Mosso and Mike Michaels discuss the vintage chronograph caliber Valjoux 72. The importance of sourcing vintage parts for this chronograph movement, the vulnerability of the ratchet wheel within the winding system, and the Vajoux 72's use in manual-wind Rolex Cosmography Daytonas is explained. Tim also notes the presence of a highly finished V72 relative, the Valjoux 234, in the Panerai Radiomir PAM 163 chronograph. Mike adds his views on the appropriate service interval for modern Rolex watches, especially the rumored 10-year Rolex service interval. Shop WatchBox: https://www.thewatchbox.com/ Instagram: https://www.instagram.com/watchbox/ WatchBox Reviews Channel: https://www.youtube.com/WatchBoxReviews Video and content by Tim Mosso and Pheline Jerome.