Unknown symbol on the back of the dial

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Hi all, I’m currently working on a 2760-4SC, caliber 283. The dial has been clearly repainted. On the back I’ve found a strange logo that i can’t find using google lens or similar sites.

I was just curious to know where this symbol is from, to add to my knowledge and documentation. Thanks for your help.

 
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I was just curious to know where this symbol is from, to add to my knowledge and documentation.
EW is the mark of Louis Eggli-Weibel & Co, SA