Prototype: Omega Speedmaster Reduced Quartz / ETA 205.111 with Dubois Depraz chronograph module

On first sight, this looks like a normal Omega Speedmaster Reduced. The only give-away is the second hands that ticks twice per second – very odd for a mechanical movement!

The case back doesn’t give much away, only that it’s unmarked, so something is different here …

This is of course very unusual – an Omega without any inner case back markings!

And here is the surprise – an ETA 205.111 on top of the usual Dubois Depraz chronograph module. Rotor and movement completely unmarked.

A felt-tip pen marking on the rotor bridge.

The ETA 205.111. It’s nice and clean with a good power consumption, so I will just change the capacitor and call it a day.

If anyone has information about this watch, please let me know. Looks very much like a prototype that never made it into production …

10 thoughts on “Prototype: Omega Speedmaster Reduced Quartz / ETA 205.111 with Dubois Depraz chronograph module

  1. This one is not too dissimilar to the Tag Heuer 2000 (162-006 and 262-006) series that used either an ETA 2892-2 Automatic with a DD 2000 module on top or an ETA 555.232 / 955.232 Quartz module which also has a double tick per second which is no fun to regulate as most quartz testers wont pick up the two beats per second. I have just restored a 262-006 after finally tracking down a replacement quartz movement from the US, which took some time as they are very rare now. However it was worth the wait as it runs superbly and is very accurate and the DD chrono module is quite a thing in terms of build quality.

  2. A Speedmaster with a simple quartz chrono movement would be considered as a fake. Here it is a DD-module attached to an Quartz ETA movement, combined with a rotor driven accumulator, making this a little bit beyond the work of a tinkerer/forger. Thank you for showing.

      • Hi Christian,
        I think thats what the OP meant actually, that this looks too OEM to be a fake, plus the dial and case look 100% Omega to me, the watch is fantastic actually and I wish Omega had sold it, maybe it would have been a Speedmaster Omegamatic?
        Anyway do you think the owner would consider parting with it?

  3. Hi. I have a question about the Omega 1538 quartz movement.
    The circuit and coil do not work, so I think I need to replace it.
    There are two versions of the 1538 model that you have mentioned in the manual. If I send you a picture in your email, can you tell if it is a compatible coil?

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