I will try to post a couple of pictures of a stone in my collection hoping that someone will have a good idea of what this stone is, and where it originated.. I got this from an estate here in Houston, with no background at all.
Hindustan honing stone....
https://sawmillcreek.org/showthread.php?247955-Hindustan-Honing-Stone-(Country-of-origin-USA)
You will find many other information on straight razor forums...
Greets Sebastian.
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