I agree that it's a Model B, but unfortunately I'm stuck with the auction catalog description. Here it is (via google translate):

Rifles, German, make: Mauser, cylinderrepeter, model C "Spitzer Bullet" Sporting Rifle. (See Jon Speed's book Original Oberndorf Sporting Rifles "page 111-112, cal. 8x57JS, tillvnr. 70110, barrel length 60cm, position, adjustable sight from 50-1000 meters, kind pressure of checked piston pistol grip, bakelitbakkappa, rembyglar, gun made in 1912, is in good condition