I have a Seth Thomas, ser. no 485222, in need of a mainspring & I can't find any info on it! Does anyone know what fits it & where I might find one? I'm stumped!

The Seth Thomas number is #707 for the mainspring Rick, if you can not find one of then you will get away with either a NYS #5134 T-End (be care as these are under the same part# for both T & hole ends) or a Waltham #2217 as they are much easier to find, a little stronger and longer but should do the job as the watch is a 7 Jewel so there will be more friction in the train.

Thank you, Sir! That's just what I needed to know!

Update. The Waltham #2217 works perfect! I now have a sweet running little watch!

Great to hear Rick

Good stuff
Resident expert on such things, Bila posts at 00:00 on the 22nd

Cool time pieces Mike!

Mike, Rick, would you guys mind posting a clear close up of your respective watches? I have some unidentified movements and thinking they might be Seth's like yours. Thanks! Joe

Joe
The Seth below is on the database.
Mark is good about that.

Pic

Thanks Mike for the pix and the tip! Joe

Here is mine

Thanks Rick, that is a nice one! I appreciate you posting. Joe