Service: Grand Seiko 9990 calibre 5722A

P1090759A customer has sent in his lovely Grand Seiko Chronometer for a service. It’s running and looks good, but could do with a routine service.

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Great looking movement with a tadpole regulator.

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Watch is preforming okay, but under the microscope I can see a lot of gunk.

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Dial is in beautiful condition.

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Hands and dial removed you can see the typically complicated Seiko wind/setting and date mechanism.

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The date disk slides on jewels that are set in the base plate.

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

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Here you can see the gunk I was talking about. It will not damage the movement, but if it gets to the dial or date wheel it will cause damage.

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The lid of the barrel is jewelled.

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Movement has been cleaned and ready to be put back together.

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I see that the balance moves freely after fitting the shock jewels.

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I fit the centre wheel.

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The clean mainspring goes back into the barrel.

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Movement almost back together.

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Winding/setting mechanism and the date mechanism back in place.

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Movement starts running straight away after fitting the balance.

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No worries here!

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Dial and hands go back onto the movement.

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Movement back in the case looking grand!

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A very nice Seiko!

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2 Responses to Service: Grand Seiko 9990 calibre 5722A

  1. Ben Francis says:

    Very nice! Startlingly similar to 5740C Don’t you think M 😉

    Like

  2. mitka88 says:

    One thing they definitely have in common is the overall good build quality.

    Like

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