This beauty is on a German aution site, eGun
From the aution description:
Very early Mauser C96, cone-hammer, numerically identical stock in perfect original state. This C96 is the only still existing pistol with matching stock from the very small series with adjustable sights. The firearm was purchased in Argentina in 2004 for 18,000$ and imported to Germany. The firearm has the long, early extractor, the one-winged firing pin, the 1000m adjustable sights, the early trigger system and the “inverted” safety. Finish is at 98%, the stock has minor pressure marks but no tearing.
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Check this out!