That stock may not be original to the gun, but it is original Parker. The RB stamp you mention is actually P.B. for Pearson Bannister who was a stock maker for Parker.
It is hard to tell by the photo is the water table what the other markings are other than the serial number. Can you clarify? That looks like a Trojan OV mark over the serial number. But it has PS barrels and a sculpted frame. VERY interesting gun!
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B. Dudley
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