I am also suspicious because of that suede-ish backside.
Additional reason to be suspicious: The size is 24/22.
The old-skool straps are 24/24 as far as I know.
But the side of the strap and the logo are quite well made...
Maybe you are right and it is simply a well made fake.
No idea about whether it used to have a buckle or not.
It doesn't look like it though.