John, that's the pin which secures the rib extension. They all have it, some more visible than others. They are often more visible after the barrels have been re blued, although I am not saying one way or the other about these barrels. The whole rib extension is a separate piece, butting against the main rib at one end and terminating in the dolls head at the other.
I moved a friend of mine into a gun like this. He was not a Parker collector but only wanted a nice shooting gun that would last for him and at a reasonable price. He has been very pleased.
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