Service Citizen chronograph, calibre 8100

P1140096A costumer has sent in his lovely citizen calibre 8100. This is a real fly back automatic chronograph that citizen developed to fight Seiko’s 6139. It’s not resetting correctly and needs a service.

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Movement looks to be in good condition.

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Watch is running, but not great.

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I remove the osculating weight.

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The reset lever is situated underneath the chronograph bridge.

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Like the Seiko 3169, the citizen 8100 has a clutch on the chronograph wheel.

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I take the movement out of the case. Beautiful purple sunburst dial.

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I remove the hands and dial and you can see the day/date disks.

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Underneath the day disk you can see the day/date mechanism.

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Here you can also see the setting/winding mechanism.

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I start taking the base movement apart.

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Movements sometimes look clean, but once you start taking them apart you find the dirt.

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Here you can see the gear train layout.

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Old mainspring.

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I clean the movement and fit the mainspring back into the barrel after lubricating it.

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I fit the cap jewels and see that the balance moves freely.

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I put the base movement back together.

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I put the resetting mechanism back together.

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Base movement and chronograph almost back together.

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I put the setting/winding/date/day mechanism back together.

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Movement goes back into the case.

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I’m happy with the performance.

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I find this movement exceptionally well made and a step up from Seiko’s 6139 because it’s thinner, has a fly back mechanism and you can manually wind it. Also I like the 6139!!

Great looking watch!

 

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