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A. Lange & Söhne

Sorry, just saw this new thread. I just posted this in the other thread...

 

A Zenith reference book says Zenith first used a multi-disc day/night moonphase indicator in February 2008, with the launch of the El Primero 4034 reference. Lange's implementation of this concept may be a bit nicer. Zenith actually did use a sapphire disc -- see this video (specifically go to 3 minutes 24 seconds into the video to hear a description of the sapphire disc). I'm not sure if other brands did this as well.

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