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American PW Elgin, 12s, Grade 345, Mainspring

horologintex

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May 8, 2007
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Hi Folks!

Need some help on the correct mainspring size for an Elgin Pocket Watch. The serial number is 26313570, and from www.elginwatches.org I have determined that it is a 12s, 17j, grade 345. But I cannot find what size mainspring I need for replacement. Also, I have heard that the manufacturer(s) of replacement PW mainsprings have stopped production because it was no longer profitable. Is this true? And what remaining sources are there for replacement mainsprings:???:?

Thanks (mainly a clock guy, but have taken the FSW Pocket watch class several times...)
 

Dave Coatsworth

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This is one of those grades that changed midstream. Early models used the #1720 and later models used the #2339. My guess is that your SN is late enough that your watch would need the #2339, although this is not clear in the Elgin material book. If you have your old mainspring out, you can measure it to get a definite answer. The #1720 is 2.23mm wide whereas the #2339 is 2.05mm.
 

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