This is the original lecture given by Dr. Matthew Clark on the topic of Hairspring Dynamics for American Watchmakers-Clockmakers Institute...
Horological Times
This is the original lecture given by Dr. Matthew Clark on the topic of isochronism and positional adjustment. Dr. Matthew...
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Recent Comments
Thank for for taking the time to point out the error in the jewel count!…
Your comment wasn't deleted lol. It was in spam for some reason. Thanks for sharing…
The Indian watch company HMT is making something they call the Nuovo with this movement.
Hi, What movement could be used as a replacement for this discontinued model? Regards David
Movement also used in Rotary Chronograph GB03633/04
The L687.5 has 27 Jewels not "25". Source (go ahead and delete my comment again.…
I have recently purchased a Longines with a 687.5 movement. "27 Jewels" is engraved into…