On an sc are they marked with an S, a C, or an SC, or something else? Putting a loop to the letter grade shows the S may be overstamped of another letter/number, but the AA do not look like overstamps, and the case color on the water table is definitely original and if overstamped I would think it would be more evident.
However, I am not the expert on Single Barrel Parker Trap guns. Do the original records show this as a different grade or is it just not in the records, by serial number?
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