Got Milk?

Here is the biggest part of my collection of white "game" marbles.  This jug is full and overflowing--need to start a new one!  Surely everyone has a pile of these somewhere.   Except for the fact that I have tried to keep an eye out for old handmade ballot box marbles, I have never attempted to identify the manufacturer of white marbles.

Gotta get your calcium somewhere, right?