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I'm pretty sure the date codes started around 1950.

I have a super speed that's from the late 1940's, a couple of New razors and others from the teens and twenties and they don't have codes.

Slow and steady wins the race. (Aesop 226 Perry index). I think choosing a blade is as much voodoo and stochastic processes with some Higgs boson influences as it is a guessing game and personal...