Your images are of a quite poor resolution, but I tend to say:
If the price is reasonable, pick it up quick!
It looks like a nice original!
I agree with Guido, the best are not the best quality but at a quick glance the buckle looks ok, but if you are going to spend big $ on it ask if you get any returns policy on it
I too agree that the Gau Essen shown is quite original. The buckle is die stamped nickle silver and when originally issued, would have had a slightly strange matte green paint finish. I wonder if the one shown has a little rubbing and loss of the obverse paint which gives a slight shine effect? Perhaps the "flash" from the camera?
Original, extremely rare and becoming harder to find. If the price is reasonable, then well worth buying.