The argument against an older marking having been scrubbed off is that this would have also affected the matching part number. In this case the top of the toggle surface is perfectly even with a deep number stamped. This would not be the case if they had removed any metal forward of the part number.
I say factory mistake, which is suble enough to have been missed by QC.
(I don't think any inspector anywhere looks at gun markings more minutely than this crowd! 8^)
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