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EB8491 vs EB8420, 8420-73, 8420-74

luiazazrambo
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luiazazrambo Super WRT Addict

luiazazrambo

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Hello Black- and Locksmiths, Clock- and Watchmakers,

would anyone know if the EB8491 balance weel would be compatible with one of the 8420 variant?

8420 suffixes:

suffix -73: new balance, since 1973
suffix -74: set lever held by spring instead screw, since 1974

I downloaded the doc for 8423/8429 and the interchange parts docs from Cousins but I cant see how I compare the 8491 to the 8420? Would it be compatible with the -73/-74 version?

Thanks in advance and take care,

Lui

2845_EB 8423,8429.pdf 3764_EB Interchange Parts 199-301.pdf 3763_EB Interchange Parts 161-199.pdf

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luiazazrambo Super WRT Addict

luiazazrambo

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It seems they share both the same balance cock and the balance. I got some help from eBay. Now the next thing is to verify whats the difference between 8420 and 8420-73. I got both of them.

Parts list for 8491:

8491.jpg

Balance cock: 121/3 Balance: 793 

Edited by luiazazrambo
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