Watch producers Certina have the right to modify watch specifications or tools Certina C020.419.11.057.00 with no notice. We powerfully suggest that you use this data as a fundamental summary of watches Certina C020.419.11.057.00. When purchasing a watch, please check the information of all supplementary settings at the retailer. Certina always had branded and non branded watches side by side but generally a higher grade movement is used in branded models. What you can do is to look at the serial number and on 60's models case backs look for a number that starts with 58 as this is the top of the line 25-651 automatic movement used from the late 50's to the late 70's.
WatchCheck is an Android app to easily measure the precision of mechanical watches.
The speciality of WatchCheck is, that as reference time only precise time sources such as NTP (network time protocol) and GPS are used, but never the imprecise internal clock of your device (mobile phone or tablet). With GPS you can do precise measurings even when there’s no data network available, e.g. when you’re abroad.
WatchCheck is implemented in Material Design, so the usage is pretty much self-explaining.
After starting the app, at first, you have to create a watch in the drawer menu, which can also be accessed by the menu button on the top left of the title bar. Tap on “add watch”:
On a new watch, you can not only add the name of the watch, but also a serial number (useful, when you measure multiple watches of the same type) and a comment.
To modify the entry, open the drawer menu and press long on the desired entry. Now you can either modify or delete it.
Important: If you delete a watch, all measurings of that watch are deleted, too!
When a watch entry was created, or a watch is selected from the drawer menu (in this case, you have to press shortly on the entry in the menu), you can add a new measuring and see the previous results (left icon) or a summary (by clicking onto the right icon):
If a comment is available for a log entry (see the info-bubble at the right), you can tap onto that bubble, and you’ll see the full comment in a popup window:
When you press on the “+” button, you come to the measuring screen; when you swipe to the left or right, you can select the measuring period to be shown. By default, the current (rightmost) measuring period is shown.
A new measuring period is usually started, when something significant changed on the watch to be measured, such as a new adjustment, or a first windup after a stop.
The measuring screen looks like that:
On the topmost card, you see the absolutely accurate reference time, either by network (NTP) or GPS or both. If both timesources are active, NTP is preferred.
On the card below, there’s the deviation of the last measuring and the current deviation. The current deviation refers to the time of the watch to be measured, which is selected by the time selector below. It’s important, that the time of the watch to be measure always refers to the full minute (second hand to zero).
When the watch reaches that time, press the button “Measure (seconds to :00)', and you’ll receive a haptic feedback.
On the left example screen, when your watch shows 9:53 pm and zero seconds, you have to press the button.
Please remember, that when you have neither a network connection nor GPS receiption, the “Measure” button is inactive and greyed out:
After you’ve pressed the button, you get to the screen, where you can enter position (at your arm, vertical, horizontal, …) and the temperature:
By selecting “SAVE”, the measuring is done and you have a new log. Please take care of the box “New period”. As described above, you can start a new measuring period here and take the current measuring as the first one of that period.
After a successful measuring (and also, when you canceled a measuring), you are redirected to the results screen:
If you made an error or if you want to correct a log, you can do this by long pressing the accoring row. You are then redirected to the screen, where you can set position, temperature or probably a new measuring period:
edit log
Only the deviation of the watch cannot be corrected, since it is determined with milliseconds precision. In such a case, you should better delete the log:
With the help menu (the three dots top right or the “menu” button on your device), you can show the help page (that very page), and ex- and import the data. The export is made in the new WatchCheck-2 format, the import can handle any WatchCheck format, version 1 and version 2:
With a simple file manager, you can select the file to be imported. The exported files are put into the root directory of the internal SD card (/storage/sdcard).
Attention: Due to a currently non fixable but, it is not possible to import data from the root directory of your device. This means, to have to put the data into a subdirectory, e.g.Downloads and then you can successfully immport it from there.
To ensure, that you measure (ideally daily) regularily your watch, WatchCheck will display you a daily reminder, every day at the same time:
If you don’t want this, or if you want to adjust the time, when the notification is displayed, you can customize this at the settings screen:
In you are on a WLAN connection, then max once a day when you start WatchCheck, the app looks for new articles on 17jewels.info and displays them in a popup:
If you don’t like that behaviour, you can disable it on the “Settings” menu item:
At any time, regardless of your settings, you can manually look for new and interesting articles (a bit broader) by accessing the menu item “articles on 17jewels.info”. Any click on one of the articles opens that article in your browser:
Required rights
WatchCheck requires a handfull of rights:
- Internet: Access to the NTP timeserver europe.pool.ntp.org for determination of the reference time and fetching new articles over WLAN
- Network state: Requires to see, whether NTP can be used as time source and to check, if a WLAN connection is active
- Fine location: Required for using GPS as reference time source
- external storage: Ex- and import of the data
- Vibration: Feedback, that a measuring was made
- Boot completed: Ensure, that the daily notifications survive a reboot
Important: No data is transferred onto the internet!
Certina Serial Number Check
Future plans
Unfortunately, the code base no longer works with current Android libraries, so WatchCheck needs a complete rewrite, for which I really don’t have enough time, I’m sorry.
Instructions for using our serial number look-up tables
This page contains INSTRUCTIONS for using the serial number look-up tables that are found on many of our watch company history pages. The example below uses information from the American Waltham Watch Company, but that is just an example. You should consult the serial number table for the specific brand of watch movement you are trying to date by selecting a company from the menu on the left.
Not all vintage watches can be dated using the serial number. Some American watch brands did not use a consistent series of serial numbers, but most of the big manufacturers did. Most vintage Swiss pocket watches did NOT have serial numbers and can't be dated by this method.
Can't find YOUR exact serial number in our lookup tables?
Many watch companies made hundreds of thousands of watches, and some companies made millions of watches! It would be impractical to list the individual serial numbers of EVERY watch made... that would make some really long pages! Our serial number tables list RANGES of serial numbers. So to determine when your watch was manufactured, you will need to find where your serial number fits within the range of numbers.
Serial number look-up example:
Certina Serial Number Check Code
Let's say you have a Waltham watch with serial number 21,607,210 as shown in the photo below. Note that we're using the serial number from the watch movement, not from the watch case. Looking at the table of Waltham serial numbers (see example below), you can see that number 20,900,000 was made in 1917 and 21,800,000 was made in 1918 (marked in red in the table below). Since your serial number falls between those two numbers, you know that your watch was made in 1917 or 1918.
Not sure which serial number to use?
You must use the serial number from the MOVEMENT of the watch... the working part with the wheels and gears... not the serial number from the watch case. Cases and watches were often made by different companies and each usually has its own serial number. You usually have to take the back off the watch case to see the movement serial number which may appear anywhere on the watch movement.
Use the movement serial number. Do NOT use the case serial number!
This is an example only. Your movement serial number may not be in exactly the same location as the one in the photo, but you are looking for the serial number that is on the watch mechanism itself... not the serial number on the external case.
| Year | S/N |
|---|---|
| 1852 | 50 |
| 1853 | 400 |
| 1854 | 1000 |
| 1855 | 2500 |
| 1856 | 4000 |
| 1857 | 6000 |
| 1858 | 10,000 |
| 1859 | 15,000 |
| 1860 | 20,000 |
| 1861 | 30,000 |
| 1862 | 45,000 |
| 1863 | 65,000 |
| 1864 | 110,000 |
| 1865 | 180,000 |
| 1866 | 260,000 |
| 1867 | 330,000 |
| 1868 | 410,000 |
| 1869 | 460,000 |
| 1870 | 500,000 |
| 1871 | 540,000 |
| 1872 | 590,000 |
| 1873 | 680,000 |
| 1874 | 730,000 |
| 1875 | 810,000 |
| 1876 | 910,000 |
| 1877 | 1,000,000 |
| 1878 | 1,150,000 |
| 1879 | 1,350,000 |
| 1880 | 1,500,000 |
| 1881 | 1,670,000 |
| 1882 | 1,835,000 |
| 1883 | 2,000,000 |
| 1884 | 2,350,000 |
| 1885 | 2,650,000 |
| 1886 | 3,000,000 |
| 1887 | 3,400,000 |
| Year | S/N |
|---|---|
| 1888 | 3,800,000 |
| 1889 | 4,200,000 |
| 1890 | 4,700,000 |
| 1891 | 5,200,000 |
| 1892 | 5,800,000 |
| 1893 | 6,300,000 |
| 1894 | 6,700,000 |
| 1895 | 7,100,000 |
| 1896 | 7,450,000 |
| 1897 | 8,100,000 |
| 1898 | 8,400,000 |
| 1899 | 9,000,000 |
| 1900 | 9,500,000 |
| 1901 | 10,200,000 |
| 1902 | 11,100,000 |
| 1903 | 12,100,000 |
| 1904 | 13,500,000 |
| 1905 | 14,300,000 |
| 1906 | 14,700,000 |
| 1907 | 15,500,000 |
| 1908 | 16,400,000 |
| 1909 | 17,600,000 |
| 1910 | 17,900,000 |
| 1911 | 18,100,000 |
| 1912 | 18,200,000 |
| 1913 | 18,900,000 |
| 1914 | 19,500,000 |
| 1915 | 20,000,000 |
| 1916 | 20,500,000 |
| 1917 | 20,900,000 |
| 1918 | 21,800,000 |
| 1919 | 22,500,000 |
| 1920 | 23,400,000 |
| 1921 | 23,900,000 |
| 1922 | 24,100,000 |
| 1923 | 24,300,000 |
Certina Serial Number Check Online
| Year | S/N |
|---|---|
| 1924 | 24,550,000 |
| 1925 | 24,800,000 |
| 1926 | 25,200,000 |
| 1927 | 26,100,000 |
| 1928 | 26,400,000 |
| 1929 | 26,900,000 |
| 1930 | 27,100,000 |
| 1931 | 27,300,000 |
| 1932 | 27,550,000 |
| 1933 | 27,750,000 |
| 1934 | 28,100,000 |
| 1935 | 28,600,000 |
| 1936 | 29,100,000 |
| 1937 | 29,400,000 |
| 1938 | 29,750,000 |
| 1939 | 30,050,000 |
| 1940 | 30,250,000 |
| 1941 | 30,750,000 |
| 1942 | 31,050,000 |
| 1943 | 31,400,000 |
| 1944 | 31,700,000 |
| 1945 | 32,100,000 |
| 1946 | 32,350,000 |
| 1947 | 32,750,000 |
| 1948 | 33,100,000 |
| 1949 | 33,500,000 |
| 1950 | 33,560,000 |
| 1951 | 33,600,000 |
| 1952 | 33,700,000 |
| 1953 | 33,800,000 |
| 1954 | 34,100,000 |
| 1955 | 34,450,000 |
| 1956 | 34,700,000 |
| 1957 | 35,000,000 |
| - | - |
| - | - |
This is an example using the Waltham serial number table. Be sure to use the table that is specific
to YOUR brand of watch when looking up your serial number.
Certina Serial Number Checker
Be sure to use the serial number on the watch movement (the mechanism).
Do not use the serial number from the watch case.