Andre,
WOW. That chrome M4 formally known as "Punky" is likely the nicest M4 I ever have known. That new black Griptac looks really good, and because the top plate and bottom plate are pristine and so clean because it was formally a shelf queen.
Funny back story is when I showed it off to my friends at the used department at B&H, Eddie said, "Look at the top and bottom plates, not a mark. Where did you find this M4." My friends at B&H were really amused that I bought it at Adorama for no money and that it came with an intact "L" seal even though it is a 1970 vintage M4.
Anyways what a great-great camera.
Cal