That happens because the serial number is put on with a die that rotates one serial number for each strike, much like an odometer on a car, and they aren't necessarily exactly aligned like the nomenclature die which is fixed.
The same example on a WW2 era Colt 1911A1. The UNITED STATES PROPERTY and M 1911A1 U.S. ARMY were put on with roll dies which will be in perfectly alignment as the die is fixed, where the serial number was put on with the same type of machine as the M1 Rifle shown above where the numbers rotate. The 0 was a little low, and the 3 a little high.
The same example on a WW2 era Colt 1911A1. The UNITED STATES PROPERTY and M 1911A1 U.S. ARMY were put on with roll dies which will be in perfectly alignment as the die is fixed, where the serial number was put on with the same type of machine as the M1 Rifle shown above where the numbers rotate. The 0 was a little low, and the 3 a little high.

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