Good day to you all gentlemen

I would like to share with you today's barn find

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A guys I adquiere a razor last week call me back to tell me he found a few barber related stuff and this hone stone was among them.
The size is 6"x1 5/8"x 11/8" overall, has two sides one is light grey and the other almost black with some inscription on it that I just can read made in Belgium.
When I saw it I said to my self if it is not a proper barber stone at least will look good with my empty razor boxes as a decor piece.
Some one can throw some info about it, it is usable more than a decorative piece?
Thanks in advance