Luger P08 Double stamped 1920.......need help!!

[bros]

I have a chance at a purchasing a very nice DWM P08 Luger in 9mm with 4" barrel. It is stamped 1920 for year of manufacture and above that stamp on the breech is the addition of the same 1920 stamp....I guess this is the gov't acceptance stamp. Are the 1920 manufacture usually reworks and re-blued? The luger is in as new condition and all serial #'s match, bore is as good as it gets. It comes with 2 serial # matching magazines, serial # matching take-down tool and a very, very nice serial # matching holster with police style strap with the additional stamps of Robert Larsen, Berlin, 1935.
I'm curious to what the value of this rig would be as I'm not that familiar with Lugers....I have read that some of these were a hodge podge of parts re-numbered to match...not sure if this is true.
Sorry don't know how to upload pictures.
Your thoughts would be very welcome.

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