Why the TUDOR Black Bay Ceramic heralds a new era for the Geneva watchmaker

Only the second brand to successfully submit a watch for Master Chronometer certification (OMEGA being the first in 2015, when it helped develop the testing process that is now applied to all of its Co-Axial watches), TUDOR had to further develop its manufacture movement in order to achieve certification. According to the brand’s spokesperson: “If you start from a regular TUDOR manufacture calibre, there's a number of changes that need to be applied. The ask to our R&D department is to be able to pass the certification while remaining within our price bracket.”

The effort involved in being certified by METAS is no mean feat. A brand needs to invest in fitting-out its workshop with all of the necessary testing equipment plus a separate production line for the timepieces to be tested. For two weeks every month, a METAS employee comes to the factory to carry out sample testing in a room dedicated as his or her workspace. The testing room is locked from the outside and inaccessible to employees at all times. If a sample watch doesn’t meet the standard of any one test, then METAS will conduct further analysis depending on the nature of the fail.

In order to qualify for METAS certification, watches must meet six specific criteria:

1. Swiss made: The origin of the watch components must conform to the established codes of ‘Swiss made’, which is assessed via a list of suppliers and proof of the orders placed with them.

2. COSC: All watches submitted for certification must already be COSC certified.

3. Precision: All qualifying watches must have less than a five-second variation per day (0 +5), compared to COSC’s -4 +6 and Tudor’s own standard for its manufacture movement of -2 +4. Watches are tested at two temperatures, in six different positions when power reserve is at both 100 and 33 per cent.

4. Anti-magnetism: As magnetic fields are a part of everyday modern life and are a curse to mechanical watches, tested timepieces must be able to retain precision when exposed magnetic fields of 15,000 gauss.

5. Water resistance: Certified watches must be capable of being submerged to the manufacturer’s stated depth rate, in this case 200 metres.

6. Power reserve: The watch must be capable of running autonomously for at least the manufacturer’s stated power reserve, in this case 70 hours.

An NFC guarantee card, supplied with the watch, digitally stores information relating to certification and links to NFC-enabled smartphones, to provide additional information to people who want to know exactly how their watch performed in testing.

“This information could be valuable through the watch’s life,” says TUDOR’s spokesperson. “It is a digital history of the timepiece. Ten years from now, our watchmakers will be able to go back to any watch that has achieved the Master Chronometer certification and be able to say, ‘OK, it provided this level of performance when it was new’.”

Currently, only one production TUDOR watch is METAS certified (although the brand’s unique, distressed-steel timepiece for the Only Watch charity auction has also passed the rigorous tests to become a Master Chronometer), but with the METAS infrastructure now in place, and more in-house calibres likely to be produced when the brand’s Kenissi manufacture opens in a few months’ time, it feels that this is just the start of a long and interesting road ahead.

Discover more from TUDOR here at Watches of Switzerland.