1930s vintage pottery custard cups, individual ramekin bowls in red, blue, aqua, green

Unmarked vintage USA pottery custards, probably 1930s. These have such wonderful old colors! It's a set of four small dishes 3 1/4" in diameter x 2 1/4" deep.

These are all in very nice condition... I don't believe they've ever been used. No chips or cracks, just a little staining to the foot of the maroon red cup.