Help in IDing a Hone(?)

Happy New year. See that it must be the Time for Hone Questions. I bought this Hone(?) at a sale a number of years ago and have just left it in a box until now. Xmas cleaning. When bought out it was all an aged 'Cream' color with the only Id being the word "GERMANY" stamped into one side. I lapped it today on one side and it comes out a very finely poressed(lot of little pores) white. It's harder than chalk or plaster of Paris. No powder rubs off onto cloth. Is it a Hone?

It's a scythe hone, because of the stamp I think it's synthetic.

Thank you . Now when I start growing my own wheat I'll be ready. It's back in the box!!

For sharpening scythes you use the sides of these hones I think. Of course you can use it anyway you seem fit. I happen to misuse Llyn Idwal slipstones :D