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Gillette Date Codes were used from January 1951 until 2001.
They are found in the top left and right corners on the underside of razor guards, both 3 peice and 1 piece models.
In my limited experience, these are not extremely aggressive.
I have pretty sensitive skin, and while I don't like the Micromatics as well, I do just fine with the 1912 razors.
These serial numbers were on the top of the guard, or sometimes the inner barrel.
There were no razor serial numbers from 1931 until 1951.Waits, and "The Complete Gillette Collector's Handbook" and Collector's Guide to American Razor Blades" by Phillip L. With the rise of the flatscreen, TV units have become more like long and slim sideboards than bulky corner pieces that have to match with the rest of your furniture.But since they changed the geometry for subsequent razors, that opened it up. It's easy when you have them "side by each" and in hand. Other than cosmetic changes, the Jr and '24 are geometrically similar and in shave characteristics similar also. Your not in a minority, the 1912 is a great razor and would probably be my #1 SE if it wasn't for the God awful noise it makes.