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Rough and pitted jewel - What are the causes?

ddrescueb2048

By ddrescueb2048
in Watch Repairs Help & Advice

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ddrescueb2048 Member

ddrescueb2048

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I was inspecting the jewels in a Seiko 7019 and noticed a couple of them were very rough and pitted. Here is an example, the escape wheel main plate jewel. I was very thorough in cleaning it to the point where I removed it from the main plate to scrub it harder! :)

Does anyone know what causes something like this to happen?

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Michael1962 Distinguished Member

Michael1962

Posted
Posted (edited)

As the bearing of the jewel to the pivot is the central hole and the immediate surface around it, the outer edge condition can possibly be like this?
Price vs quality?

I’m a newbie by the way, so take my comment as exactly that. Just a comment. ? 

Edited by Michael1962
watchweasol Distinguished Member

watchweasol

Posted
Posted

Hi  If the finished portion (bearing surface ) is in good condition, no cracks/chips the outer surface is irrelevant, I may have been finished in that condition or it may be that some lubrication/ cleaning agent has reacted with it but as the brearing surface is ok I would suspect the former.

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ddrescueb2048 Member

ddrescueb2048

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Michael1962 and Watchweasol,

Thanks for your replies. The inner hole portion is in good condition as well as the back side where the cap jewel rests. Really, all surfaces are mirror smooth aside from the flat side. I first wondered about chemical damage but other jewels and the pivots look okay.

That was my guess as well; just what you get with a cheap movement. The pivot looks good after all these years so, I believe you're right, this is likely irrelevant.

Thanks again!

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