Saxonia dual time, Saxonia automatic and Saxonia outsize date all have the same gold plated rotor. However, the choice to use a metal other than gold is not unique to Lange as VC for example use Tungsten and im sure other brands did or do so. I think the choice to use a more efficient metal far outweighs the desire to have gold everything for purely aesthetics reasons or to give the impression of luxury.
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