Those Mach3, like pictured, were known as
GRAB, YANK, & PULL, and a slimy coating from the glide strip. I believe it was some kind of numbing agent, cause a couple hours later I was wondering if I'd shaved with a broken beer bottle, and I was coming down with the chicken poxs. I shaved off a 1k hone and pasted leather belt for many years, and never had that feeling since. Even better since learning about the various hones made for producing proper shaving edges.