I've got a turkey stone and was told to keep it wrapped in an olive oil soaked rag when storing it.
Mine doesn't have tags on it either, the tag(s) probably came off decades ago because of all of the oil.
No tags on the box either, just hand writing that says Turk.
It is a fast cutter with chunky grit. Definitely not for a razor or knife. I use it on my adz, froe, splitting wedges, and axes to for bevel resets. It is also good for sharpening shovels, hoes, and lawn mower blades.