Speedy Apollo HELP - I think I popped the clutch

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Morning,

I was winding my speedy 345.0808 yesterday and looked down at it a couple hours later and it wasn't running. The watch will wind smoothly but doesn't start up after winding. It was supposedly serviced in Japan a couple years ago so I'm wondering if I should send it to Nesbitt's for a full service or will they just fix the clutch w/o a service. Any help is appreciated.

thanks in advance for any sage advice,

Keith
 
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Can you wind it until you feel a definite resistance?

Or can you wind it for hours and no resistance is felt?
 
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Broken spring?

Yes, broken mainspring. Full service will be needed.