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Thanks guys for all the input!

The backside is purple/ maroon, which was leading me away from blue whetstone as I thought that was blue. The variation in thickness of the 2 layers made me think...

By the way it is roughly 2 inches wide by 6 inches long.

I'm fairly knowledgeable about straights, but pretty novice about hones. I picked this one up at a flea market as I thought it was possibly a coticule, if not some other natural bi-material stone. ...