The downside of these complications is that the watch has a slightly anemic power reserve, 38 hours with the chronograph running, and a maximum of 48 hours. Patek recommends, in fact, that you don’t run the chronograph continuously, however. The movement features an off-center Gyromax microrotor and Spiromax silicon balance spring running at 21,600 bph. The watch requires a sizable 799 parts and 67 jewels to function, and meets Geneva Seal standards, but unlike most split-second chronographs, there’s less to look at on the movement side than you might expect.
In fact, the watch is modular, with most of the technical parts of the watch hidden under the dial side. On the rear, you can see the engine-turned micro rotor and black-polished hammers for the repeater, as well as the governor for the repeater hidden under the brand’s Calatrava cross in gold. But under the dial, you have the perpetual calendar module (which is generally how perpetual calendars are designed anyway). The lack of an integrated split-second chronograph might seem a simplified approach, but it required 80 new parts and a number of changes, like a thicker mainspring for the extra power draw, and an isolator that is thicker, for more reliability. The movement also has a new anti-backlash wheel with integrated sprung teeth for more accurate activation.