Restoration: Omega De Ville

 In Watchmaking

I got this Omega De Ville watch in a batch to look at. It didn’t run and it was impossible to wind it or set the time. The diameter of the watch is 33 mm without the crown.

The movement is the 620 cal with 20848991 as the serial number which dates it to 1963. The Vintage Omega Database has this model recorded as 111.0077 as part of the 1962 international collection.

If you’d like to know how to authenticate and date your Omega watch, click here.

Disassembly

This Omega De Ville is a front loader. That means that the movement with the dial and hands need to be lifted from the front. In order to do that, I first have to remove the case back.

 

Omega De Ville

Caseback with reference nr. 111.077

 

Then I remove the case clamps and screws and I loosen the set lever screw to pull the stem and crown.

 

Omega De Ville

620 cal with 17 jewels

 

In order to be able to lift the movement with dial and hands from the front, I removed the bezel and crystal. Similar to the case back there is a notch in the bezel where you can insert a case knife to carefully twist the bezel off.

 

Omega De Ville

The bezel with the crystal removed. The dial and hands are still in a great condition

 

Then I remove the hands. To do this I use a sheet of plastic to cover the hands and dial and then I lift the hands with 2 levers. The plastic sheet protects the dial from dents or scratches. After that, I removed the movement with the dial.

Problem and solution

When I remove the dial it’s immediately clear what the problem is. The return bar or clutch lever has slipped out of the clutch. When this happens, the clutch doesn’t make contact with the winding pinion so you can’t wind the watch. Also, it doesn’t push the clutch towards the setting wheel or intermediate wheel when you pull the crown. This could happen because the set lever bridge screws weren’t fully screwed down.

 

Omega De Ville

You can see that the return bar has disconnected from the clutch

After I connected the return bar with the clutch again, I was able to tighten the set lever bridge by fully screwing its screws home. When I tested the movement it started to tick right away so I decided to assemble the watch again. Same procedure but then in reverse. While I was at it I immediately fitted a new crystal as well.

 

Omega De Ville

This Omega De Ville looks like new again. Readings on the timing machine are an amplitude of 308 degrees, rate is +4 sec a day and beat error is 0.2 m/s

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Showing 4 comments
  • Aditya
    Reply

    till which year this watch was produced ?
    International collection 1962-omega vintage archives
    Ref No. ST 111.0077-omega vintage archives
    this is the serial no. 23,000,000 which indicates year 1966
    is it genuine?

    • Melvin Hollenberg
      Melvin Hollenberg
      Reply

      Hi, I don’t know till which year this watch was produced. It’s genuine though, there’s no reason to assume otherwise.
      Everything is just as it should be with a vintage Omega. They must have produced it for several years.
      Also, keep in mind that the Vintage Omega Database is known to contain more than a few mistakes. They even miss complete refs and movements.

  • MIGUEL A TORRES
    Reply

    hi, THANKS A LOT FOR THIS INFO…please can you tell the size of crystal and the stile…I need to get one for my de ville 111.077

    • Melvin Hollenberg
      Melvin Hollenberg
      Reply

      Hi,

      The Omega part number for the crystal is PN1005. It’s a regular acrylic crystal.
      Sorry but I don’t know the size. You’ll have to measure it yourself or bring it to an independent watchmaker.

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