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A. Lange & Söhne

Taking a stab, but consider the source before relying!

 

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I'm flying without a license on this one, but doesn't the existence of a regulator mean that it is not free sprung, and isn't that a regulator? (Pic borrowed from SJX) Whatever the case, it is a beautiful watch, and the larger balance wheel should enhance accuracy.

Best,

Jed

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