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A. Lange & Söhne

If I'm recalling correctly, it's a historical artifact -- one of the requirements for the Geneva Seal

 

Something about column wheels having to be capped or nicely decorated in some manner, not simply left unadorned. Vacheron Constantin's chronograph column wheels aren't capped like Patek's are, yet have the Geneva Seal, though, so I'm sure there's something to do with the way the requirement for the certification is stated and interpreted. I don't remember.

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