Not to diagree, but those are practically chrome-- the TLJ is certainly shinier than other versions, but it looks more satin to my eye. Again, as I say in the guide, there is an insane amount of retouching going on in TLJ. Just look at the way the buttons chance on the Luke hero shot to shot in the one scene it's in.
Nitpicky point: Any change in appearance is more likely to be a result of the grade than any VFX tampering. We can assume they had to rebuild the Creepy Uncle in post to replace Hamill's hand. I don't see a reason for VFX to alter the Graflex in every scene, so it's not really evidence of much either way.
Anyway, thanks to Graflex Bank, here's a BTS of the saber compared with the final shot:
The grade crushed the blacks for sure, and increased overall contrast. But the original still looks pretty darn shiny to me.
(Yes, I am aware that VFX would have had to alter this shot to remove the puppet rods and that this potentially undermines the point I made above. Shut up.)
Also, neither VFX nor TLJ's final grade would affect this BTS footage:
Check out how sharp the reflections of her fingers are, especially in the close up. You can see a reflection of the seam in her glove! I'd call that practically chrome, myself.
Granted there are other shots where does look a lot more satin:
Either way, though, none of my three vintage tops are anywhere close to how glossy this one is. I really think this idea should be taken seriously.