6139- Movement: 17 vs 21 Jewels

Spencer said:

There are different jewel counts because the 21j model has jewels in place of bushings in four places. The plates and parts of the two "A" movements are entirely swappable. A's & B's are not for the most part, especially the train bridge, chrono wheel, chrono bridge.

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spidefunk said:

Ahhh..nice info, maybe 6139 21j is jdm and 17j for international market

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pollyc said:

That's correct


Take heed to Spencer's advise re; parts interchangability vis a vis A/B revisions, comparison of the parts numbers will reveal that there are quite a few different ones.

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GrammarOfDesign said:

Mike & Spencer,


You guys are Awesome - Thank You !


I lucked out I guess that these are both "A" movements, and the extra jewel count does not harm the interchangeability aspect (for the most part).


Thanks!


Yes, they are.


Too, I think the 21J 6139A movement is "rarer" than the 17J movement, from what I've read.


Dan
Jon

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GrammarOfDesign said:

After reading Mike/Polly's tutorial on how to overhaul your 6139- Chrono, and the warning to be careful with substituting 6139A movement parts with a 6139B movement, I opened my 2 6139 chronos to see what I had.

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3Pedals_6Speeds said:

Can you link to this tutorial?

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