Lusterware animal condiment sets

These marvelous little sets include a salt and pepper and matching condiment (or mustard) pot, all on a little tray and hopefully including a little spoon. The sets come in many shapes and are mostly rather small, no taller than 4" with the S&P proportionately smaller. I haven't done a lot of research, but I do believe most were produced during the art deco era. Many similar animal sets came out in the same time period which were not lusterware - but are equally attractive.