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Course Seagull movement


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I have this course movement and upon disassembly, the mainspring literally fell apart in my hands.  I sourced a mainspring replacement that I thought was correct (ETA 6497-1) only to discover that the arbor is much too small for this mainspring.  Did I order the wrong mainspring or did OFrei ship the wrong mainspring?  Their part :  MS-65R, 6X5X18 1/2.


Thanks,


RMD

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