I’ve featured a few Omega Seamasters before but never a calibre 284 so I thought this one worthy of inclusion! It arrived for a movement service and to have a caseback seal fitted as there wasn’t one present.

It has a slightly worn back but the Omega symbol and hippocampus are still visible albeit faintly.

Once the back is removed you can see the calibre 284 movement in all its glory.

With the movement uncased and the hands removed you can see the dial was a little grubby but I cleaned the worst off with a cotton bud and saliva!

Once I removed the dial the calendar side can be seen….

….which was soon stripped.

I turned the movement over to allow me to start on the motion work side. As you can see it has a weighted balance and indirect seconds drive.

I took the power off then removed the balance and pallets….

….then the train and bridge….

….and it was soon fully dismantled ready for cleaning.

The only thing that needed replacing was the mainspring due to a broken hook, so one was ordered and I started the reassembly without it. Here the wheel train and bridge has been fitted.

The balance and pallets were next….

….then the movement was turned over and the dial side was rebuilt.

With the absence of a new mainspring that was as far as I could go so it was put away until it arrived.

Once the postman had been I carried on with the rebuild, heres the new mainspring ready to be fitted.

The barrel was refitted….

….then the bridge and wheels.

The cleaned dial and handset were refitted….

….and the movement was recased. A new caseback seal was also installed.

And that was it, another Seamaster bought back to health. Lovely little timepieces aren’t they?