This year, the brand brought out an open-dial version of the watch, the Quantième Perpétuel au Grand Balancier Open Dial. Four openings around the dial and one at its center reveal the movement in all its glory.
The watch features a 24-hour display with day/night indication at 9 o’clock, big date just below the central axis, leap year at 12 o’clock, and month and day on either side of the Antoine Martin logo. The 60-jewel movement beats at 18,000 vph and is regulated in five positions.
It boasts a free-sprung balance and what the brand calls a “High-Performance Escapement,” or HPE, which has a lever and escape wheel made of silicon. The escape-wheel teeth and the pallets are shaped differently from those in a traditional Swiss lever escapement and increase the mechanism’s efficiency, the company says.
A power-reserve display in the cut out stainless-steel caseback tells you how much of the six-day charge has been depleted. (Also visible from the back: the extra-large titanium balance wheel.) The case is made of stainless steel with a combination of polished and satin finishes. The bezel has a DLC coating. The watch comes on a black rubber strap with deployant buckle. The price is $44,500.
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