It looks in pristine condition, with the back logo really mint !
You got yourself a rather complete set indeed.
The original strap was a suede type by Corfam, but they were very biodegradable and have long turned to crumbles (or, shouldn't be touched as they inevitably will if you find one..).
I too believe that the buckle at that period was the late type / fatter applied logo and probably 16mm inside, but except this detail it is really great.
Plus, I think most came on bracelet, not strap, so you are covered in that department !