What is the numbering system used on the blades? — Classic Shaving

 Some brands of razor blades stamp the blades so that if there is a quality control concern during the manufacturing process there is a way to identify the sides of the blade. Usually the blade has "1 2" on one side and "3 4" on the other. People frequently ask if the numbers are to designate a side that is better for
What is the numbering system used on the blades? JustinSt. Louis, MO

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