Little Celluloid Egg-Shaped Box

Just a lovely little egg box, I believe made of celluloid, threaded on the inside--perfect for holding a few pills or some precious little thing inside. The color is a nice warm caramel and the box is in great shape; it screws closed easily and stays tight.

1 1/8" long x 7/8" across. I have not found a match of this, but would guess it dates from the the 1930s or 40s.