Patek Philippe

Folks, I read about this in my manual for the 5170j... what is it? I assume that it is a clutch of some type that prevents overwinding... clicking once it's reached full wind. I don't have the courage to wind to this point (of clicking) on my 5170j so wou... 

"The new Bugatti watch boasts another innovation - its dynamometric crown . It is harmoniously integrated just above the profile, representing an essential technical component in tune with the watch's aerodynamic lines. A slight pressure is required to re... 

Dynamometry is therefore the measurement of force (determination of force). I know this term from physics and medical sciences. A dynamoteric crown is a crown that gives simply the same force to the main barrel, smothly, evenly when wound. That is a featu... 

In fact, it enhances the winding efficiency so you need to turn less the crown to fully wind the watch. A famous watch uses a dynamometric system through a key and not the crown: the Lange 31 days. Fx...  

Man, that is going to leave a mark on your wrist! Mike S.

..friction clutch - the crown starts to "slide" when a certain torque is reached. It's a safety function to prevent excessive forces, which would do harm to the winding train or mainspring. A nice and usefull fetaure, especially considering the sometimes ... 

Suitbert, and others, thanks for your replies. Does this mean that winding past the friction point will result in just clicks... and hence no damage to the movement since the mainspring is already fully wound? Appreciate the insight here folks.

...tecchnically that would be correct, although I'd expect a smooth sliding rather than clicks - but I know this crown design only by PP's description and never tried it out myself in real. Best Suitbert

Due to the large crown, you will feel the slight difference when fully wound but it will not come to a stop. A power reserve indicator helps though. cheers F

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appreciate it fellow purists.