This Longines dress watch came in for me to take a look at. It has a Longines 280 movement.

The serial number dates this watch to 1961. Click here for more information about how to date a watch.

Longines dress watch

The crystal is very scratched. The crown is worn and crooked and the stem is bent. Two of the lugs are bent as well

The watch did run but it didn’t keep time and it kept stopping. The lugs (2 of them) were bent. The winding stem was bent and the crown and the crystal were in a bad shape.

Disassembly

At first glance, the movement looks clean. I did notice that some old lubrication clogged up the escape wheel bearing jewel. Something like that will easily cause problems for your watch.

Longines dress watch

The red arrow points to the blocked escape wheel bearing jewel

Remove any power from the mainspring. Lift the balance and the pallets.

Longines dress watch

The balance and the pallets removed

Remove the ratchet wheel and the crown wheel. Usually, a reverse fretted screw secures the crown wheel. This Longines has 2 little screws with normal screw threads to secure the crown wheel core.

Then, lift the barrel bridge and the train-wheel bridge.

Longines dress watch

The barrel bridge and the train-wheel bridge removed. The main barrel is visible. The main barrel cover is on the other side

Then remove the gears and the main barrel. I put the main barrel aside to examine. This is why the watch keeps stopping for no obvious reason.

As you can see in the picture above, this is a main barrel that has a mainspring with a T-end.  The Longines 280 comes in 2 different versions. With a T-end and with the normal bridle.

It looks like someone tried to fit a barrel lid of the normal main barrel onto this one that has a T-end mainspring. A cover for a main barrel with a T-end mainspring has a little notch to secure the T-end. This cover doesn’t have a notch so naturally, the mainspring is bent and the cover is warped out of shape.

These main barrels are sealed units. That means that you should replace the whole unit in a service. They aren’t designed to open and clean them. Unfortunately, I can’t find the correct part to replace.

Longines dress watch

This side of the movement is empty

Turn the movement around to remove the motion works and the keyless works. Put all the parts in the watch cleaning machine for 6 minutes per bath.

Assembly

Start with the 3rd wheel and the main barrel. Then the rest of the gear train.

Longines dress watch

The gear train and the main barrel fitted

Replace the train-wheel bridge and the barrel bridge. Fit the crown wheel and the ratchet wheel.

Turn the movement around and reinstall the motion works and the keyless works.

Longines dress watch

The dial side of the movement finished

Turn it back around and reinstall the pallets and the balance.

Longines dress watch

The Longines 280 after the service

I’ve cleaned and lubricated the movement, fitted a new winding stem and a new crown. I’ve also fitted a new crystal.

Sadly, this Longines still doesn’t run. A lot of parts are getting more and more rare every day. Besides the skill and know-how, you also need access to the correct parts to repair or restore a vintage watch. Some parts are ridiculously expensive if you can find them. Other parts are just obsolete and you can’t find them anywhere. The fact that the Swatch group has stopped selling parts to independent repairers doesn’t help at all.

Longines dress watch

This Longines dress watch is a nice looking vintage watch again

Did you have some watch projects that didn’t go as planned as well? Do you have some tips on how to get the correct main barrel for this Longines with caliber 280? Let me know in the comments below.

Founder & editor of WahaWatches. I’ve been collecting watches for years. My favorite part is to pull them to bits.

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