Service IWC Shaffhausen chronograph calibre C.79320/ETA 7750

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The same client that sent the Rolex in has now sent in his IWC. Like the Rolex, this watch also stopped abruptly after a game of golf.

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Well it’s very obvious what made this watch stop! as the watch has not been serviced in a long time we also decide a full service is in order.

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Important not to forget the pusher extender piece.

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Dial removed you can see the day date mechanism.

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The date ring sits on a separate plate that comes off the movement.

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With the plate removed you get to the hour recorder, day/date wheels and the setting/winding mechanism.

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Time to start taking apart the upper chronograph layer.

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The reverser wheel is held in place by the same bridge that holds the second and minute recorder in place.

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You can see there is quite a bit of dirt.

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Almost down to the base movement.

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Here you can see the setting/winding mechanism.

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Here you can see the gear train layout and the hacking lever.

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Old mainspring

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Movement cleaned and ready to be put back together.

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I see the balance moves freely after fitting the cap jewels.

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Gear train coming back into the movement.

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Base movement back together and ticking.

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Super performance.

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Chronograph layer coming back in place.

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Day and date back in place and working as it should.

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Dial and hands on the movement and I test that everything works like it should.

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Movement goes back into the movement.

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Another watch that from now on will stay away from the golf fields;)

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6 Responses to Service IWC Shaffhausen chronograph calibre C.79320/ETA 7750

  1. Brandon says:

    This guy must have a serious golf swing…don’t know if it’s a good or bad one…but must be interesting to watch! 😝

    Like

  2. Gary says:

    Great and fantastic work as always! Mitka, I have a question. How long does a complicated movement like this take yo to disassemble, clean, and reassemble?
    Gary

    Liked by 1 person

    • mitka88 says:

      Hi Gary,

      You never know how long it will take.

      Sometimes it’s a straight forward job and it will take about 4-5 hours. Other times there are unexpected issues that add several hours of work…

      Like

  3. matabog says:

    Are you serious? what impact force does it take to displace that spring? I think that is the most powerful spring in the 7750 (besides the mainspring)!
    Great work, btw!

    Like

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