Help nedded with some engravements,please :)

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Greetings everyone 😀
I saw today these engravements on a watch I own and I can't figure it out what they are so I need help from anyone what is the meaning!
I tried my best with the photos!
Thanks in advance!
 
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Guesses, gold grade, case maker, import marks…
 
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At least one I suspect is the gold plating thickness in microns.
 
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At least one I suspect is the gold plating thickness in microns.
Thank you X350,I was thinking that too!