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O.K.,,,, since I don't own one, I'll back out & let someone who does , take it from here.

Is this after cleaning?

We really can't see the entire stone's condition,,, but always start simple & safe,,, progress from there, if needed.
**** First be aware of any labels that might be attached to the stone*****
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I don't know anything about Droeschers, but it looks like a nice stone. If you can get some photos of it out of the box, side shots too,, then it really helps the guys that do know.