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How will I know which ones are hard?

thanks

It does not feel perfectly smooth, but like it has little catches/grabs along the way. I just lapped it with 1K sandpaper. But I am super-noob, so not a reliable source.

cheers

I have never seen a vintage Thuringian, so I do not know what they look like up close. However, I believe that my NOS has inclusions, so I have included pics seeking assistance.

1. Brown spots....