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Yes,

Very similar. This one did come from an old time carpenter who passed away so seems plausible.
Beautiful looking object. Would anyone know how to use one of these for razor purposes?

Yes, been browsing the web and very much looks like it. What approx grit rating would you give this?

Here's the stone wet.
It doesn't really give up a slurry, it's kind of glass like in texture, very hard stone.
I got the worst of the dishing out on a concrete slab. It took for ever to get flat.
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Recently acquired some hones that appear to be naturals. This one is of particular interest. At first this was black saturated in old oil and rusty swarf and very badly dished. Jet washing and...