To me it looks like a thin engraved plate wrapped around the clamp, like super thin adhesive backed aluminum that's been cut to size and had the lines lazer cut. Just something they could have easily whipped up and wrapped around the clamp, but thicker than just using mylar tape.
You'll also notice that whatever is around most of the clamp doesnt cary over to the side bars OR the activation switch clamps. If the whole thing was a repro, wouldnt it all be the same color? That makes me think something else is wrapped around the main body, and stops up under the sidebars.
View attachment 557361
And i think I'm seeing a change in thickness and finish right here, where that second layer would stop.
View attachment 557360
In the end it comes down to what is most likely. Is a prop guy gonna spend the time and money to reproduce and copy something that is fine as is aside from the stamp on it, or just find a quick way to cover up that Graflex logo and call it a day?
EDIT:
Something similar to this could be used, thick enough to not see the engraving underneath, but thin enough to wrap around the clamp. 3M Scotchprint Titaniuml Vinyl Flex Wrap, but without the brushed texture of course.