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A. Lange & Söhne: I'm surprised that none of the comments mention the fact that this is an instantaneous jumping QP.

I'm sure the OP can make their own judgement about the dial color and case material. IMO it's important to point out the technical tour de force of the instant jumping calendar indications. Synchronizing these indications (especially since they're displayed by various different styles of display) is
1Y
By: brandon1
1

Patek Philippe: I'd be interested to hear from Patek why they opted for a design with 2 extra wheels in the going train. Seems like an odd compromise, considering...

...the extent to which each additional wheel decreases efficiency. Perhaps a moderator could ask? That said, I got half of what I asked for in my post from May 23, 2018 when I asked for a "new manually wound caliber with overcoil, that can fill a 38mm case." Best, Brandon
1Y
By: brandon1
1

Patek Philippe: Simplified version of the movement in the 6300

This appears to be the a variation of the repeater layer of the Grandmaster Chime, based on the bridge layout and placement of jewels. Best, Brandon
1Y
By: brandon1
1