Opinion about 1120 caliber

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Hi guys,

I would buy a new watch equipped with the caliber 1120.
I have some photos, someone can help me with checking if it's legit?

(Who know this "PJ" in the intern part of the back of the watch? I saw it many times)

Thanks
 
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Looks fine to me.
 
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Looks fine to me.

Ty Archer, i saw in many omega watches the "PJ" like a sign, do you know something about this?