This is the original lecture given by Dr. Matthew Clark on the topic of Hairspring Dynamics for American Watchmakers-Clockmakers Institute...
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I have a similar one with more perlage and signed DF&am...
Colino191 , 3 hours ago
Hi this movement is inside of a 1910s era trench watch....
andyf , 4 days ago
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calibercorner , 4 days ago
Which quartz movement is better
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What is the reference for the ETA 2623 endstone
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