Charlie,
the originals Renato Gamba P08s have the Renato Gamba (RG) logo on the chamber and the receiver is marked with "Mauser P08 4" Serie Speciale Renato Gamba".
In your case Mauser reused frame and receiver that already received the special numbering but not yet the inscription and the logo.
The receiver has been finished with the standard American Eagle to "fulfill" the Interarms requirements.
Enjoy your nice gun!
Mauro
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