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It's 20 x 4,8 x 1,8 cm.

I remember when you bought the stone, turned out nice! Does yours have a bright yellow slurry as well?

I'm glad no one pointed out it could be a coticule while the auction was active, thanks :)

Here's a picture of the lapped stone:

94587

The auction has ended. To me it looks like a coticule possibly used with oil in need of backing.