I can't seem to find any information on this hone

I have a Frank Hess special #100 razor hone.
On the box it is labeled Hess Hair Milk Laboratories
Saint Paul, Minn.
Measure's: 15/32" thick, 29/32" wide, and 4 - 9//32" long
It is a two sided hone, that appears to have been poured in a mold.
I was curious about the grits of this stone
Weather it was molded by a cold or hot process. Also any information on it. I can find the razors, but nothing about the hone.
Thank you, russhi

Ask Sham over at razorandstone, also a member here. I think he's tried every hone under the sun...almost.

His user name on both sites is Hi_bud_gl

The razorandstone site is his new one.