- 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.
- Apr 06, 2017 For the final serial production, a slightly improved version, the 25-681/682, was introduced in 1972. You can identify watches with this movement through the marking '288' on the dial. The last Certina-developed self-winding movement was the 919/920-1.
E.g., Rolex has its serial numbers hidden between the lugs, whereas Certina has theirs on the caseback. The serial number is commonly engraved on the caseback of a watch. Alternatively, the serial number can be located between the lugs or engraved on the lugs. Serial number on a watch. NOTE: You will find the serial number on the back site of case back of your Certina watch. Certina movement decoder Get specifications for a Certina movement This tool looks up the various specifications for a Certina watch movement. If you wish to date your watch or find out other details including which movement it has inside it please use the Certina serial and reference number decoder. Please note this tool is new and any feedback about correct or incorrect.
This page will enable you to track down the production year of your vintage watch.
If you want to know which year your vintage watch was produced?– Then take a closer look at ” Serial numbers by year”.
While Omega keeps the serial number on the inside of the backcase Certina leaves the serial number visible on the out site of the watch back case accompanied with a reference. The two numbers serves the same pourposes as explained in the Omega chapter above-written. Though in the periode dating from 1958 to 1974 the reference number on Certina watch carried an encrypted message giving away, which calibre the watch was equipped with, which material the case was made from and which watch model you are dealing with.
Together with a reference number, the brand Omega placed their serial numbers on the inside of the backcase. One serial number indicates in which year or periode the watch was produced while the other number (the reference number) indicates which model or serie the specific watch belongs to.
In some cases, such as the watches produced by the brand Eterna, serial numbers were not used as markers to know the year of origin. Instead Eterna made sure we can date watches since their calibers were only used in short periods of time.
To put a date of production on your vintag Longines watch you have to locate the serial number which most often is found on the in- & out-site of the back case. When you have got the serial number then look it up in our Longines serial number matrix. While seaching for the serial number please remember to enjoy the sight of your Longines watch movement.
The very early Tissot watches had the serial number engraved on the back site of the dial. Later on the serial numbers were made easier to locate. On most vintag Tissot watches you will be able to find the serial number engraved into the watch movement. While your are at it remember to note the calibre number of your watch it may come in handy some day.
Introduction on how to find & use serial numbers
Service: Certina Club 2000 With 25-66M Movement
This is a wonderful vintage Certina Club 2000.
Although it’s one of the lower grade Certinas, it’s still beautifully finished and it has a solid stainless steel case.
All the Certina in-house movements that I’ve encountered are great performers and you can accurately regulate them with the micro-regulator.
Sadly, the 25-66Mmovement in this Certina wasn’t running.
Certina produced the 25-66M from ’75 till ’77. This Certina has a serial number that consists of 9 digits and that indicates that it’s a ’74+ piece so it’s all adding up.
There were some problems with winding because you could wind it forever without it ever building up any resistance. If you think that sounds like a broken mainspring, you’re right!
It also had some problems with water resistance because at one time the crystal fogged up during an exceptionally hot day.
Disassembly
Before you start working on a mechanical movement, make sure to remove all the power from the mainspring. This way, you’ll minimize the risk of damage when working on the wheel train later.
Move the click away from the ratchet wheel and let the crown slip between your thumb and index finger.
Lift the balance and the pallets.
Turn the movement around and lift the cannon pinion. The cannon pinion is installed on the center wheel post so you won’t be able to lift the center wheel later if you don’t remove it.
As you can see, this movement is a bit different.
The crown wheel is located within the wheel-train bridge instead of the barrel bridge. The ratchet wheel overlaps the wheel-train bridge as well so you’ll need to lift the crown wheel and the ratchet wheel before you move on.
Lift the wheel-train bridge to expose the wheel train.
Remove the escape wheel, 4th wheel, and the sweep second wheel.
Take out the barrel bridge and lift the main barrel.
As suspected the mainspring was broken, so I had to find a new one. This was a bit of a challenge because the exact dimensions that Bestfit and the GR folder mentioned, were obsolete at the warehouses.
Luckily, a friend had one in his stash of parts so he sent it to me.
Lift the center wheel cock and remove the center wheel.
Certina Serial Numbers For Sale
Flip the movement around and begin with the bottom plate.
Pre-clean the pivot holes and bearing jewels with a peg wood.
Clean all the parts in the watch cleaning machine.
Assembly
Start with the center wheel, the center wheel cock, and the main barrel.
Lubricate the post of the center wheel before you assemble it and lubricate the arbor on both sides of the main barrel as well (both with Moebius HP1300/D5).
Reinstall the barrel bridge.
Place the escape wheel, 3rd wheel and the sweep second wheel and refit the wheel-train bridge.
Install the ratchet wheel and the crown wheel.
Don’t forget to lubricate the crown wheel shim with a tiny bit of Moebius HP 1300/D5.
Turn the movement around and start with the motion works and the keyless works.
Lubricate the posts for the setting wheel, the return bar, and the cannon pinion with Moebius 9501.
Don’t forget to lubricate the finger of the set lever spring that is in contact with the set lever.
Flip the movement to the top plate and start with the pallets.
Lubricate the exit stone of the pallets with Moebius 9415.
Replace the balance and enjoy watching the movement come alive.
Take out the Incabloc jewel holes and jewels on both sides and clean and lubricate them (Moebius 9010).
After I cased the movement, I fitted a new crystal (with a tension ring).
I also fitted a new case back gasket which I lubricated with a lubricating sealing grease to increase/restore the water resistance.
Finally, I treated the inside of the crown with KT-22 grease. It makes the crown wind smoothly but more importantly, it protects against moisture and rust and creates a waterproof seal.
During test running the mainspring broke again! I guess it must have gotten bad somehow during storage.
I had to order a new one but the exact dimensions still weren’t available.
In the end, I ordered a mainspring that was 0.005 mm thinner – 0.115 instead of 0.12.
Certina Serial Number Decoder. Use A Certina Serial Number ...
0.005 is mm is only slightly different and the newer mainsprings are a bit stronger than the older ones so that shouldn’t be a problem.
The amplitude of 328 degrees is proof of that.
What do you think of this Certina? Do you have a similar watch? Let me know in the comments below.