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Posted

Hello! I was desperately searching some parts of my watch.

I have JLC 5001.42 cal.900 - and my poor watchmaker said that the automatic of the watch is not working. It can only works by manual winding.
Can you please identify the part? (photos attached)

What is the name of this gear? 

 

Sorry my english.

Regards.

5cf7863b-5e26-41f0-81f4-a53cea20427b.jpg

683d890f-4eff-4da2-b3ce-11535d5be2b5.jpg

Posted

I don't think there's any chance of finding a tech guide on this, so no parts list. The same wheel from another caliber (Heuer 12) is listed as "coupling wheel mounted" part #1521. The Swiss use a standardized part number system, for example 721 is a balance complete, for all makes and calibers; to the part number you add the make and caliber when ordering a part.

 

Not to sound harsh but if your watchmaker doesn't know this you might want to find another. Also, from the images, it doesn't show any signs of being broken that I can see. Are you sure this is where your problem lies?

 

Finally, JLC won't sell parts. You can sometimes find vintage NOS parts from suppliers or elsewhere, but for more modern calibers there's not much you can do if you're not affiliated with the company.

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