The movement is a Tissot 2481, which is a close cousin of the Omega 1481. These movements have a quick set date function that works by pushing the crown in to advance the date by one. This is a known weak spot in this movement prone to failure, but on this example it is working perfectly. As a Lee-Enfield rifle fan and owner (Im American BTW so yes, I own firearms) one of the most fascinating things I find is to trace its history through all of the various proof marks. In service, out of service, into armory for refit, and so on. I enjoy a rifle that has traveled as much as the re. ) cal 2481 Tissot Seastar for 85 Euros. This is the Omega movement I now have a number of choices: 1) Simply drop the entire Tissot movement into the Cobra and drop the Omega movement into the Seastar, clean it up and sell it for parts/restoration (with full disclosure).
This Tissot Seastar also belongs to Michael. He bought it and it was DOA. Only one thing for it …
There is a fair amount of dirt in here, and that’s good enough of a reason for the watch not to work.
This is the calibre 2481, with the first incarnation of the quick-set date which requires pushing the crown in. The quick-set mechanism was modified in subsequent versions, and doesn’t work that well on the 2481.
There is dirt throughout, and it’s probably been some time since this movement has seen a service.
No rust or obvious damage. I’ve removed the balance jewels, and work my way through the bottom plate.
After all the parts have gone through the watch cleaner, I reassemble the movement again.
Top plate done, and the balance is swinging.
Only half wound, this is looking very good!
Starting on the bottom plate, I notice that a leaf of the cannon pinion is missing. Time to order a new one …
Tissot 2481 Stem
Now I can reassemble the bottom plate.
Bottom plate complete bar the hour wheel.
The movement goes back into the case.
The case back gets a new gasket.
With new case screws (the old ones were missing), I put in the auto-winder assembly and close the case.
Tissot 2481 Omega 1481
Final check on the timegrapher – I’m happy with that!