This is a 10uF polystyrene capacitor. It is switchable in ten steps, each 1 uF. Tolerance is 0.25%. I use it to extend the range of my GR1615 upto 1000 uF. It’s 1uF value is at the moment 1,001,906.233pF. So it is +0,19%.
It is made from the 60’s upto a few years ago. This light color makes it a late version.