Cheese KEEPER
I have two, one round one and one smaller square one.
You put vinegar and salt in the bottom to retard mold. And dilute with a little water.
They both have the instructions right on the lids. Easier to read on the square one.
The round one is from the late 1940s, the square one from the 1960s.
I've been meaning to put them on ebay, just not yet got around to it.