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A. Lange & Söhne

I think the middle of the case was

 

brushed later, and not by Lange, the watch original came with polished case...

If it had made by Lange, it would have been looking different: more deep brushes in a certain direction.

I am sure that if you make detailed pictures and send them to Lange they can answer your question easy...

Lange has long time its own case department, only Glashütte Original has outsize resources for his cases.

Yours,

Adam

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