Thread: Panama Combo Hone?

Wanted to see if anyone had any 411 on what this barber hone might be made of...

I know a lot of barber hones are made of alumina or other such materials, but yesterday I lapped a beat-up old 2-grit combo "Panama Hone" (originally $3 from Chicago), and I'm *really* impressed with how it performs.

The lighter-colored side feels like the lower grit of the two, but both sides feel like significantly higher grits than my Swaty or other barber hones. Actually, the black side feels suspiciously like my (non-vintage Mueller) Thuringian, and works up the same kind of "slimy" feeling slurry.

Also, both sides appear to have small inclusions, which may be the result of the lapping, but I can't remember seeing inclusions in any other barber hones I've lapped.