Longitude
Longitude Titanium is a COSC-certified chronometer with a power-reserve display and an imposing seconds counter paying tribute to John Arnold’s marine chronometers and his decisive role in calculating longitude at sea.
unique true beat mechanism
The true-beat seconds’ function is characteristic of John Arnold’s instruments supplied to the Royal Navy. Their escapement used to beat at one oscillation per second, naturally indicated by a sweep-second hand. This explicit function inspired Arnold & Son to create one of its most iconic complications: ‘True Beat’, also known as deadbeat seconds. The distinctive feature of the DSTB collection is that it displays this mechanism in full on the dial, hence the ‘Dial-Side True Beat’ name, delivering watchmaking, design and spectacle all in one.
The collection
precious metals only
DSTB is available in a 42-mm diameter case in red gold (5N) or platinum (PT950) for a thickness of 12.95 mm.
balanced design
The design of DSTB is truly exceptional. This is because the true-beat seconds’ mechanism needed to be displayed in a way that reflects its historical importance for Arnold & Son. It has been placed on the dial side, creating an additional level in the calibre. They are openworked, three-dimensional, and carefully crafted from red or white gold, depending on the version of DSTB. The presence of this true-beat seconds mechanism fills the space and is balanced out by the off-centred hours dial in white opal, which is another signature of Arnold & Son.
oscillating 22-carat gold
DSTB is equipped with the calibre A&S6203 movement, which was entirely developed, machined, assembled, and adjusted in-house. This movement is self-winding, thanks to an oscillating weight of 22-carat gold. It has a power reserve of 55 hours and a regulating mechanism that oscillates at 28,800 vibrations per hour.
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Ultrathin Tourbillon is one of the slimmest in the world. Presented in its purest expression, nothing distracts the eye from the hypnotic workings of the one-minute flying tourbillon.
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