Hi Al. I'm pretty sure it's original, font and stamping look factory and matches the rest of the gun and the frame has the various cryptic letters and numbers on the inside surfaces.
The profile of the front curve of the receiver looks consistent, (no obvious deformation due to metal being removed), I'm just assuming that the letter must have been lost in the refinishing as the most obvious answer. Having said that, quite a lot of metal must have been removed to obliterate it completely !
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