Thread: Any idea what these hones from the UK are?

I have seen these labelled hones pop up for sale several times, does anyone have an idea what type of stone they are? I have one on the way from the UK, but was curious if in the meantime anyone on here has had any experience with them. I find the recommendation to use them dry interesting. Thoughts?

Is a kind of barber hone, not a natural stone.

I think they are naturals. And, thank you! I was also curious about those stones. All I know about them is from the link, so...
Vintage British Greywacke Barbers Hone
Anyone who knows about them or uses them, we need feedback.

I'm not that knowledgeable about naturals, but a close-up of the grain(hone side, top) & a side shot really help.

Usually when label say from three to five strokes is because isn't a natural stone.

The instructions to use it dry and only for 3-5 strokes would make me believe it to be synthetic as well, which is why I've avoided them. OTOH if Neil Miller, who's pretty knowledgable about stones, thinks it is a natural stone then that's probably what it is

Or is it made from pulverised natural stones and not actually cut?