Tudor Black Bay Heritage Master Chronometer
41 mm Steel case with Burgundy Bezel
Jubilee Style Bracelet with T Fit Locking Clasp
COSC (Contrôle Officiel Suisse des Chronomètres) and METAS (Master Chromometer) certified*
Tudor Boxes & Papers July 2023
Booklets & Swing Tag
List Price (2023) £3,720
*METAS, or the Federal Institute of Metrology, was first established by the Swatch Group in 2015 and is considered the crème-de-la-crème of certifiers.
They test for Magnetic Exposure, Water Resistance, Power Reserve, Accuracy and Rate Deviation. If it fails any of these tests, the manufacturer doesn’t receive its METAS certification
COSC stands for Contrôle Officiel Suisse des Chronomètres, and was founded in 1973 to ensure a standard of accuracy across the Swiss watch industry.
This testing institute will take any movement that is submitted and it will be put through fifteen days of testing. During that time, the movement will be placed into five different positions (where the movement is rotated, including dial facing upwards, downwards, and then various positions on its side using the 3, 6 and 9 o’clock positions) and three different temperatures of 46°F, 73°F, and 100°F. When tested, the temperature should not affect the watch more than .6 Seconds a day, and the average daily rate cannot be more than -4/+6 seconds off.