The obvious depression on the obverse could ? be the result of local corrosion, in part caused by poor mixing of the alloy at this point.
Local XRF analysis may be helpful to prove.
As an alternative, it could ? also be the result of impact damage, but there is no reflective evidence of this on the other side of the coin.
Unlikely to be a lamination, because that only happens with modern rolled blanks.
Although this coin is lightweight, It's appearance in the pictures suggest to my eye that it is genuine. Evidence of tensile metal distress in the radial edge splits supports authenticity.