Stand 3-4 of those amps next to each other if you can. A close view of the black writing on the amps would be nice also.
On the amp, is propionate spelled the same way that it is on the box in your pic?
From what I can see it looks fine. The truth is only a crappy fake is easy to spot. A good one can be damn near impossible to spot.
I was just using the same amps and the quality was excellent.
I don't want to know your source. Did these amps come to you from Pakistan proper? eastern europe or some other location?