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Concur with hector, A kink or twist in hairspring, exactly at regulator gap can cause this, so move the regulator arm to exposed hairspring ( H/S ) there and check with high maginfication. Regulator slot not wide enough or nearly/ fully closed, the gap just limits breathing of H/S. Damaged regulator gap, a close up high maginfication of the gap helps. Is regulator arm fitted fully in the setting groove? Good luck.
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