Internet Horology Club 185
Help w correct mainspring

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https://ihc185.infopop.cc/eve/forums/a/tpc/f/3426047761/m/7561028821

April 18, 2005, 17:52
Ron Birchall
Help w correct mainspring
Can someone identify the correct mainspring for an Elgin 21j BWR, grade 478? The material book I have lists several.

Thanks

Ron
April 18, 2005, 19:34
Brian C.
Ronald,
A grade 478 takes a spring with a part number of 817.
Brian C.
April 18, 2005, 20:12
Ron Birchall
Thanks Brian