Pair of Vintage Gauge 11 10" Knitting Needles Made in England

Original Unused Vintage Knitting Needles.
Made of casein, a plastic made of milk protein which predates modern plastics.
I've been told these are very warm and comfortable to knit with.
Probably from the 1950s.
They are gauge 11 and 10" long
I have them in red, blue or yellow.