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A. Lange & Söhne

I can’t speak to the precision of the numbers.

 

However, overall it appears consistent with the most definitive article I’ve come across on the Datograph.

https://langepedia.com/a-lange-sohne-datograph-guide/

I opted for the 403.035 since I love the black dial Langes in general and personally I prefer the dial and dimensions of the 1st generation compared to the Up/Down.

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