Welcome aboard, Mustang.
The inner sideplate number is perfectly normal. It is ALWAYS marked with a number one digit higher than the serial number's first two digits. From the two photos provided it looks like it has its original finish as well, but more images would help confirm this. Photos of the grip innards would help as well. It was not unusual for field armorers to replace a damaged grip with an unmarked grip. It is not a deal breaker when valuing the pistol.
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