Manufacture
A. Lange & Söhne 1815 Moonphase Honey Gold: The Engraver's Challenge
A. Lange & Söhne · Mar 5, 2020
Visited the Lange manufacture a few years ago with this. Got told by the engraver of my watch that it was a real pain to do the balance cock because of the hardness of HG. HG has a hardness of 300 HV.
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