Thread: 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?