The 2018/19 Inter Third Stadium shirt is made by Nike. Inter and Nike’s logos are both heat-impressed on the Original and the Fake shirts.
The central cross and the marble fantasy are a couple of shades darker in the Fake shirts than they are in the Original ones.
On the top right, above Inter’s crest, the marble fantasy is slightly different in the Fakes and it doesn’t follow a precise “scheme”. The horizontal stripe of the Cross is slightly taller (and so is the Pirelli sponsor) in the Original shirt.
The small yellow stripe on the neck is lighter in the Original shirt. The size label is written in dark grey in the knockoffs; it’s light grey in the Original pieces.