So what you have is a Type B commercial sporter from the Mauser Werke factory in Oberndorf. It dates to 1922, best estimate.
My impression is that it's been reblued, but without having it in hand or seeing better pictures, I'll reserve judgement. The additional screw holes for the peep detract slightly from the value. Rear sight is obviously missing, and the front sight looks like it might have been replaced.
I recently picked up a similar rifle, though not in as good condition, for $900 with taxes, shipping and auction premiums all in. That wasn't a steal, but I don't feel like I was fleeced either.
I would rate yours at $1500 - 2000.
I think that these particular actions, the pre-war commercial 98's specially built for the .30/06, are the finest Mauser actions ever produced. Most ( maybe all ) had small diameter barrel threads, which means that the receiver walls are thicker. The magazine is longer than that for an 8x57, and feeds beautifully with the .30/06. The hinged floorplate with the release in the guard bow is a handsome touch.
Very fine rifes.