Brian, in the Remington era, the "B" notation is mentioned in the Serialization Book. There may have been earlier mentions. You are correct in saying that many round grips in the hammerless era had the "P" code in the Serialization Book. I'm not sure whether that was a default entry or an actual reference to round knob pistol grips. If you will look in the SB, you will see many more "Ps" than you will see round knob pistol grips. Don't believe every "P" you see in the Serialization Book.
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