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
Serial numbers recorded for fraud prevention purposes. Feb 14, 2016 One cold order gold watches with special engravings so it could be that the number isn't a Certina number except the '9' and might have been a serial number for a big company or government agency. It is a nice watch what ever it is though. From the serial number on the case back we can accurately date this watch to being made in 1968 – normally anyway. It would appear that this watch has a Certina case back, but that it isn’t original to this watch. This movement was made between 1951 and 1960, so the serial number can not be correct. The serial number also has seven digits. The reference number of this period is made up as follows: The first two digits indicate the movement that was used. In this example, the 87 stands for the Certina 29-064 (Valjoux 728).
From the serial number on the case back we can accurately date this watch to being made in 1968 – normally anyway. It would appear that this watch has a Certina case back, but that it isn’t original to this watch. This movement was made between 1951 and 1960, so the serial number can not be correct. You can be sure you are buying a genuine Certina watch if you follow these steps: - buy a Certina watch only from authorised Certina retailers - ask the retailer for the credit-card size guarantee, duly completed and including the watch reference and its serial number, purchase date and their full company name and address.
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
Excalibur Wind Up Watch With Serial Number
Certina Serial Numbers Us
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.