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Is there a prize for "Best guess"?
I used to have a junk store, and always put things like this on the counter under a sign that said,
"If you can convince me that you know what this is, you can have it!"
Come to think of it, some of that stuff is still in my garage...
Francesca
P.S.
How about a picture (maybe taken on a lighter background) of the other side?
And is there any lettering /numbering at all on it?
F.