Strange mark on omega lug

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Hello guys,
I see this mark on the lug of my omega de ville Co axial, during some checks.
It seems to be √66052 (sorry for my bad quality pic)
It’s only a watchmaker sign or could be a symbol or personal dedication?
mathematically it doesn't seem to have much value 😅
I find this quite strange, especially on a modern watch, but maybe I'm missing something 😃

What do u think about it?

 
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It’s impossible to know. Could be a watchmaker mark, inventory mark, something relevant to a previous owner.