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Serviced a lot of these and generally they are lower in amplitude even with a fresh service.
A lot of times just a good cleaning of the impulse jewel and the fork slot boosts the amplitude a lot.
What I’m curious about is that they slow a lot with the low amplitude before service. After service if you let the mainspring down to have the movement around the same amplitudes around 200 the slowing is gone. Any ideas what that could be?
New part number on the pallet fork since some months back.
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