Ball for BMW TMT
Limited Edition of 1,000 Pieces
The case, iun stainless steel black DLC, measures 44mm x 13.2mm. It has an AR-coated sapphire crystal, a sapphire display back and it is water resistant to 100 meters.
Movement is the Swiss automatic Ball caliber 9018 with 21 jewels, 28,800 vph and a power reserve of 40 hours. It features a mechanical thermometer module. It is COSC-certified as a chronometer and has a patented Amortiser anti-shock system and it is anti-magnetic to 4,800 amperes.
The most difficult technical challenge Ball Watch technicians faced when working on the mechanical thermometer watch project was limiting the height of the entire movement module to within 5.1mm. This design obstacle involved delicately fitting the bi-metallic spring within the height of the milling of the main plate and bridge. Ball Watch invented a unique system of fine regulation that does not block the bi-metallic blade and filed a patent for the fine regulating screw.
The patented screw regulator system is the crucial part in achieving high accuracy in temperature measurement. It stabilizes the position of the bi-metallic coil but allows it to adjust with changes in temperature.
The strap is rubber with a Ball steel DLC buckle.
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