I've now got the frame unpainted: 4 days of 180 grit emery cloth and a wire brush on a dremel.
But it was worth it, this frame must have been really special back in 1953.
Fully chromed and a lot of it still there
Hand crafted fancy lugs
Some chrome missing but no real rust damage
Now I have to remove any flaking chrome, I'm thinking my oxalic acid window box might help.