I remember these types of razors and the blades that were used well.
I also remember almost every bathroom had a metal medicine cabinet with a mirror on the front above a sink. When you opened the mirror inside were shelves for different pill bottles and supplies.
And in the back was a small slit to drop the used blades into. The old blades just fell through the slot into the wall space behind the sink.
I alway thought that was very odd, and dangerous if someone ever had to cut into that wall only to be surprised by a lot of old rusty dangerous razor blades.
I actually saw a pile of these in a wall of a house we were renovating once.