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

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.