Before pressed powder there was loose face powder and I believe this was to help in the application of powder or maybe just to even it out. Fun little brush measures with base a little over 2 5/8”. The tube when the brush is screwed back in is around 2 ¼”. All in good working order and the case and hair brush are in great condition. This is probably circa 1950’s – mid-century. Check out the pictures on interesting piece of makeup history.