Razor Blades Behind the Walls

Excluding a few years in college I have always lived in 100 year old houses, but hadn't experienced the razor slit in the medicine cabinet

The old razor blades seem to be a result of small slots in some medicine cabinets common in homes built before the 1970s Before plastic,

razor shark casino slot So it goes into the wall and inside of it Pretty durable little piece Anybody know what that's for? So that little slot is for straight razors When the

razor blade wall slot Best way to dispose DE razor blades · Blade Disposal Slot in the Medicine Cabinet · Vintage Gillette DE 3-Piece New Model Safety Razor, Made In