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    • Service: Omega Speedmaster calibre 1861
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CJN Watches
  • Instagram
  • Home
  • About
  • Contact
  • Customer Area
    • Login
    • Logout
  • FAQ
  • Service documents
    • Service: Omega Speedmaster calibre 1861
    • Service: Webster (Minerva 19/9CH) mono-pusher chronograph
    • Service: Omega SM Cal 350 Bumper
    • Service: Omega SM200 banana Cal 565 Work in Progress
    • Service: Omega Seamaster De Ville Cal. 1020
    • Service: Rotary quartz
    • Service: Smiths car clock as used in Jaguar E-Type Series 1
    • Service: Omega SM Cal 562
    • Service: Poljot Manual Cal 2614.2H
    • Dubois Depraz module DD2000
    • Service: Omega SM60 Cal 565
    • Service: Omega Seamaster cal 503
    • Service: Omega Seamaster SM300 with Cal 552
  • Watchmaking
    • Study: Amplitude equalization and pivot polishing
    • Study: Hand and dial re-luming
    • Study: Improving positional performance
    • Study: Balance staff replacement
    • Study: Bridge bushing and straightening
    • Study: Dial lacquer removal and respray
    • Study: Repairing damaged hairsprings
    • Study: Chrono pusher seals
  • Privacy
  • Instagram
  • Home
  • About
  • Contact
  • Customer Area
    • - Login
    • - Logout
  • FAQ
  • Service documents
    • - Service: Omega Speedmaster calibre 1861
    • - Service: Webster (Minerva 19/9CH) mono-pusher chronograph
    • - Service: Omega SM Cal 350 Bumper
    • - Service: Omega SM200 banana Cal 565 Work in Progress
    • - Service: Omega Seamaster De Ville Cal. 1020
    • - Service: Rotary quartz
    • - Service: Smiths car clock as used in Jaguar E-Type Series 1
    • - Service: Omega SM Cal 562
    • - Service: Poljot Manual Cal 2614.2H
    • - Dubois Depraz module DD2000
    • - Service: Omega SM60 Cal 565
    • - Service: Omega Seamaster cal 503
    • - Service: Omega Seamaster SM300 with Cal 552
  • Watchmaking
    • - Study: Amplitude equalization and pivot polishing
    • - Study: Hand and dial re-luming
    • - Study: Improving positional performance
    • - Study: Balance staff replacement
    • - Study: Bridge bushing and straightening
    • - Study: Dial lacquer removal and respray
    • - Study: Repairing damaged hairsprings
    • - Study: Chrono pusher seals
  • Privacy

Category Archives: Chronograph

Home / Archive Category: Chronograph

Seiko 6138-3002 – an early 2 register, vertical clutch automatic chronograph

January 24, 2019Chris Nicholas5 CommentsAutomatic, Chronograph, Seiko

I received this Seiko 6138-3002 from a customer who lives fairly close to me in Somerset, UK and it’s not run for some time… These are a great technical accomplishment by Seiko and this movement calibre was released in 1969 – there is a little history here.  It’s a big watch being part of the […]

Valjoux (ETA) 7750 service and build – part 2

December 31, 2018Chris NicholasAutomatic, Chronograph

With the base movement set up, the chronograph parts are added, starting with the cam and springs: Then the start/stop lever and bridge. All parts checked for wear and cleanliness as the build progresses.  This is a chronograph runner. Showing the chronograph runners in place. And the hammers and bridge fitted. Finally the remaining springs. […]

Valjoux (ETA) 7750 service and build – part 1

December 31, 2018Chris NicholasAutomatic, Chronograph

The ETA 7750 (originally Valjoux) is pretty much the industry standard chronograph and has the full chronograph features plus day and date complications as well as being an automatic calibre.  These are usually a pleasure to work on and this Zeno is no exception. A lot of parts in these – this container just showing […]

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