Can someone provide with the part number for a mainspring for the following watch:

Elgin Serial #12,570,630, grade 294,18s,7J.

Thank you in advance!

Grant

That's a 5th Model.

Mainspring #812

Thanks Tim!

A replacement would be a: JA-101,strength 2 or
JA-102,strength 1

For an Elgin #812



Frank