Released in 1941, the Clog-Pruf is the middle child in the Micromatic family. It's also between the earlier Open Comb and later Bullet Tip/Flying Wing Micromatics in aggressiveness, making it kind of a Goldilocks razor: almost as efficient as an Open Comb Micromatic, and almost as smooth as a Bullet Tip. This one is in nice shape, but does have some scratching in the chrome blade cover. Along with the Patent 1912 razors, I recommend the Clog-Pruf as a great first Gem-style razor. It's also many shavers' favorite.