SchoolHouse Regulator

hunterryk

NAWCC Member
Jan 8, 2010
4
0
1
I have a time only 8-day Regulator movement, only markings, are an "SD" on the front plate and an upside down "J" on the same plate, any Ideas, It has a broken mainspring I need to replace. Will work on a pic!
Thanks in advance for your help!
 

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