To commemorate its 175th anniversary, Swiss luxury watchmaker PATEK PHILIPPE on Tuesday unveiled a new $2.6 million wristwatch.

Featuring 18-karat gold and sapphire crystals, the Grandmaster Chime timepiece is the most expensive wristwatch Patek has ever built.

It has two faces—one that shows the time and the other, the calendar. The case turns on a vertical axis to alternate between the two (below).

It’s the most complicated wristwatch ever, featuring 20 different complications including a range of different sonneries and repeaters.

The company apparently logged 100,000 hours for the watch’s development, production, and assembly with 11,060 meticulously hand-finished parts in the seven limited-edition exemplars of the watch.

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One of them will go on display in the company’s permanent collection, while the six others are priced at 2.5 million Swiss Francs ($2.6 million).

Here are the watch’s 20 complications: 

1 Grande Sonnerie
2 Petite Sonnerie
3 Minute repeater
4 Strikework mode display (Silence/Grand Sonnerie/Petite Sonnerie)
5 Alarm with time strike
6 Date repeater
7 Movement power-reserve indicator
8 Strikework power-reserve indicator
9 Strikework isolator display
10 Second time zone
11 Second time zone day/night indicator
12 Instantaneous perpetual calendar
13 Day-of-week display
14 Month display
15 Date display (on both dials)
16 Leap year cycle
17 Four-digit year display
18 24-hour and minute subdial
19 Moon phase
20 Crown position indicator (RAH)