This piece has been in my home many years & I always used it as a candy dish. However, I believe that it is an ashtray. There are 3 grooves on each side of the platter like piece. Appx. 10" x 4" with no chips or cracks. A rough type of green painting on the clay, it may be a style or just wear. It is quite unique. The back is quite crude & at the top of one end it is etched: 3968 GERMANY. There are a couple of marks on top & bottom, black & result of the clay deteriorating. Result of minerals in clay.
I have no doubt that this is a very old piece but still know very little about it. I am selling it "as is".
A great addition to that special collection!