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Patek Philippe

Ok now I take it back; I don't think its instantaneous - The following vid demonstrates similar classical mechanism of the QP

 

www.youtube.com


Notice a tiny cam driven continuously (by the cannon pinion/motion works) that lifts the grand lever - that progressively changes the date non-instantaneously. I think this Patek exhibits identical mechanism.

For comparison, the following movement is the 5208 dial side which is of the instantaneous variety. Much more complex than your regular QP with a different grand lever setup - I'd be lying if I said I knew how it works at this point in time!

Regards,
skyeriding

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