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A. Lange & Söhne

It looks like a regulator on the RL, but....

 

but I think, on the Richard Lange at least, it's actually to do with the beat of the movement, and just happens to look like a swan's-neck regulator.  The RL is free-sprung, and uses a system that superficially at least looks very similar to the Patek "gyromax" system.

Not sure about the new 1815, but the old one wasn't free-sprung.

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