Found it...

It's a Norton "Yankee Clipper" sharpening stone that is double sided with "coarse and fine grit".

It says you have to use "Bear Oil".

I wouldn't know how to harvest oil from a bear even if I knew how to catch one.

I need to get a better sharpening system. Most of my blades do not have a convex edge, but the DMDC does.

Any suggestions on where to start?

JYD #90 A man carries a knife everyday... even to church.