Had to reply on this one, my dad has worked on the metal industry for more than 30 years, on different kinds of plating and patina finishes, and back when I was a teen with my first Graflex he immediately told me it was chromed, you can tell by certain lighting condition it has a blue like finish, but definetely nickel goes before the chrome.
That's what I thought as well. Nickel is far more yellow-ish.
Roy