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Joe,
The wavy, uneven interface is the clue. One stone almost melds into the other without a sharp deliniation. actually in some spots it may be a fairly distinct line but in others if just fades...

The seller sent me a little more info this morning. He bought it new in 1995 in Soviet Georgia at a store that had shaving supplies from Germany. He said at that time there were many European item...

Howard,
Thanks for the info. It did sem an unusual piece and a stroke of luck catching it. It was listed just moments before I found it and had a a Buy It Now.

The little dark patch in the upper...

I found this on eBay last Thursday evening. The seller thought it was quarried in Holland or the Netherlands (same place?). He didn't have any more info than that.
The seam between the colors is a...