Rolex 15210 calibre 3135

This beautiful gents Rolex oyster perpetual date came in recently for a service. It has a gorgeous engineers bezel and the loveliest deep blue dial I’ve ever seen on one of these.

Rolex oyster perpetual date 15210

The caseback is typically Rolex meaning it’s completely undecorated.

Rolex oyster perpetual date 15210

With the back removed we can see it’s powered by the venerable calibre 3135, an automatic, 28.800bph movement with a Bregeut overcoil hairspring and Glucydur balance.

Rolex oyster perpetual date 15210

Once the movement is uncased and turned over you can see that beautiful dial and handset. The hands are lined up here ready for removal.

Rolex oyster perpetual date 15210

Underneath the dial are the calendar components which features a date change mechanism that snaps the date over instantly.

Rolex oyster perpetual date 15210

With the date ring removed the top plate can now be removed.

Rolex oyster perpetual date 15210

You then get a view of the gearing and keyless work. As usual with Rolex the plates are very well finished.

Rolex oyster perpetual date 15210

Once the dial side components are stripped the movement can be turned over to start on the motion work. I always remove the rotor and autowind mechanism before removing the movement from the case.

Rolex oyster perpetual date 15210

I’ve removed the balance bridge here which gives a view of the two brass screws that are used to adjust the balance end shake, very simple and very useful!

Rolex oyster perpetual date 15210

Farther into the strip down the wheel train is now on view.

Rolex oyster perpetual date 15210

It wasn’t too long before the movement was ready for cleaning and inspection.

Rolex oyster perpetual date 15210

Rolex oyster perpetual date 15210

A new mainspring was fitted, even though the amplitude was in the 270’s it’ll be a few more years before this is serviced again so it’s worth doing whilst it was apart.

Rolex oyster perpetual date 15210

Rolex oyster perpetual date 15210

Assembly starts with the mainspring barrel and centrewheel.

Rolex oyster perpetual date 15210

As it progresses the train an bridges are refitted.

Rolex oyster perpetual date 15210

The balance bridge is refitted, with the freshly lubricated end jewel and cap ready to install. Rolex uses a Glucydur balance which is a very stable and heavy material, and a Breguet overcoil hairspring which helps with isochronism.

Rolex oyster perpetual date 15210

That’s the motion work done, just the calendar side to reassemble now.

Rolex oyster perpetual date 15210

It’s ready for the top plate in this shot.

Rolex oyster perpetual date 15210

A quick check shows the date changes correctly and the quickset is functioning properly.

Rolex oyster perpetual date 15210

The dial and hands are next to be refitted.

Rolex oyster perpetual date 15210

The movement can then be recased….

Rolex oyster perpetual date 15210

….and the autowind mechanism rebuilt….

Rolex oyster perpetual date 15210

….and refitted.

Rolex oyster perpetual date 15210

The case was closed up and she’s ready for a few more years. I still can’t get over the beautiful deep blue of the dial, simply gorgeous!

Rolex oyster perpetual date 15210

Rolex oyster perpetual date 15210

Rolex oyster perpetual date 15210

3 comments

    1. There’s not really such a thing as a little clean on the inside to be honest, a watch will either need servicing or not. The only way to clean the watch on the inside is to strip it and if I’m doing that it’s usually because it needs servicing! My prices are here though for reference.

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