It has two rows of numbers on the back: 747 along with a text that says 'Waterproof'. The logo is the 'two c's' Certina logo along with 'Automatic', and it has arrowhead numbers apart from 12, 3, 6 and 9 which are a sort of bars or roman numerals, double for 3, 6 and 9 and triple for 12. Nov 20, 2014 This feature is not available right now. Please try again later.
![]() warranty
The highly-precise movement on this timepiece has been officially certified as a chronometer by the independent testing institute COSC. Quality of this calibre speaks for itself.
All Certina chronometers therefore have an extended warranty of three years in total from the date of purchase.
Please enter the number several digits long, which is right at the bottom of your watch's chronometer certificate:
![]() the cosc
The renowned Official Swiss Chronometer Testing Institute (“Contrôle Officiel Suisse des Chronomètres”, or COSC) was founded in 1973 and is based in La Chaux-de-Fonds, Switzerland. It is an independent public institution serving the Swiss art of watchmaking. Its strict criteria are considered the standard for evaluating the precision of modern wristwatches – whether equipped with mechanical or quartz movements.
Quartz chronometers
COSC Certification is considered worldwide to be the epitome of precision. All quartz movements presented here are subjected to strict tests at a variety of temperatures. The maximum permissible rate deviation at 23°C is +/- 0.07 seconds per day; at 8°C and 38°C the tolerances are +/- 0.2 seconds; Precidrive™ movements overcome these hurdles easily.
Automatic chronometers
The demands placed by the COSC on modern timekeeping are very high. Automatic (self-winding) watches are tested here for 15 days at three different temperatures and in different positions; their rate deviations are measured and recorded scrupulously. In order to obtain the coveted “Chronometer” title the rate precision of a movement must fall within the range of -4/+6 seconds per day.
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