It is not uncommon for a factory to break a number stamp and replace it with one from a different font. No big deal and nothing to worry about as far as record keeping goes.
There are some cases where a number added at the front or back of a serial number would indicate a problem, like a "1" added at the front of the serial of a low-number M1903 rifle to make it look like a double heat-treated, but this is not one of them.
Jim
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