Unusual Balance Cap Jewel

Mike Ritchey

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Nov 15, 2012
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Anybody familiar with this type of cap jewel? This is from the platform escapement in my Chelsea model 12 E Ships Clock. The serial number on the clock dates it as a 1970s manufacture clock. The platform has an Incabloc logo on it. I would like to know how to dismantle it to clean it properly. I originally just cleaned it in situ and oiled it through the triangular opening in the cap jewel. I originally posted this in the clock repair forum but thought I might get some replies from the watch repair experts as they work with lever escapements routinely. Thanks for any help!!!


CCAA2B1B-4455-4096-AD15-35E356326DB5.jpeg 8E16E5B0-F46E-4294-A186-3489739F0028.jpeg D34E52C7-4C17-4550-9339-DCE0BD0EAD94.jpeg
 

Skutt50

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Mar 14, 2008
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And to remove it from the balance cock I would guess that the regulator arm is what it locking the jewel holder in place. It should come loose with some careful prying.
 

Mike Ritchey

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Nov 15, 2012
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Acworth, GA
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Thanks for the info!! Roughbarkd the picture helps a lot. I say it is "unusual" because I've never seen one like that in 15 years of amateur watch repair and clock making. All of my stuff is vintage so this is pretty modern compared to what I have worked on before. I guess if you had never seen a kangaroo it would be unusual......Ok I guess a kangaroo is unusual even if you have seen one ;).
I take it the jewels are both friction fit to the bushing?
 

roughbarked

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Dec 2, 2016
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