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I think you're talking about this system (pics)

 

g



This one was in a Mido (if I recall correctly) and the system was identified in some reference book or another as "Incastar". And it's a terrible idea by the way. You can't regulate it without not only putting it out of beat, but also effectively "peening" or otherwise mutilating the hairspring in ways that require significant additional adjustment to correct.

_john

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