Mauser never made chromed pistols, so the chroming essentially ruins it as a collectible. It is likely worth $150-200.
You will need to start by contacting Mauser
The Mauser pistol was used by the detective in the movie The Cheap Detective. The Mauser was also used by Sherlock Holmes in the movie A Game of Shadows.
Mauser was located in Oberndorf Germany.
50-500 depending on specifics
100-300 USD
765.00
The first production semi auto pistol was the Mauser c/96 "broomhandle" pistol.
20-200 USD or so
Will depend entirely on condition. Could be $50, or $250. Most will be in between.
value depends on overall condition
Depends on whether this is a pistol or a rifle - Mauser designed and produced many guns. Also, what condition it's in.