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Where did you buy it? What are your concerns? Nothing jumps out as 'fake'.
Yup, certainly a fake. Send it to me and I'll give you $100 bucks to help you recoup some of your loss because I hate to see anyone get taken advantage of.
Looks entirely fine to me, throw it on and try it out.
The engraving on it looks wrong to me (note, comparing to the near-identical bracelet on my wrist!).
On mine, the JIG and 11 are IDENTICAL in depth/width/etc to the rest of engraving, on yours it seems both lighter engraving and thinner engraving.
ALSO, the STZ number on mine is identical, EXCEPT yours has an additional '1' at the end. (STZ013899 vs STZ0138991). Otherwise the engraving characters are the same.
EDIT: Other than the engraving photo looking suspicious (though not conclusive!), it seems dead on.