Box of 12 Sets of 4 Double Ended DUREX Casein KNITTING NEEDLES Gauge 13 - 10 or 12"

An original unused box of Durex Knitting Needles.
Inside there are a dozen sets of 4 double ended knitting needles. in several very bright colours.
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 all gauge 13  (2.25mm wide) and I have them in 10"or 12" long
The mixture of colours in each box varies.