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Yes, that's what the brownish one looks like to me too: a nice old Turkey hone. The cracks in various directions, their brittle nature and fast, but shallow cutting action are good indicators. Once...

+1
But what an extraordinary shape! What's the size?

'Very porous' would have been a more apt description. Mine doesn't absorb water yet either, but it holds unbelievable amounts of oil and sucks in solvents at an amazing rate.

After alternate...

Similar to number 1 (and David's):

25588255892559025591

25592

Previously used with oil. Very thirsty. No box. Medium. 222x38x33mm. I think it's some Norton India.

Yes, the similarity is striking. That one was tentatively identified as a Dalmore Yellow. Quite a lot of senior members and hone aficionados will attend the Mid-MO meeting; I'm looking forward to...