I'd start with Amazon. Your rifle is a Savage model 340, and if you search for Savage 340 scope mount, you will get a lot of hits. The mount and a set of rings is about $53.98. Shoot safe and often.
You have to mention the gun to get an answer.
how much is it worth and is it accurate.
you can get that mount at mid way
Midwayusa.com
Gun show, gun shop, want ad
Gun shows, gun shop
I have two answers for you. Crosman air gun owns both Benjamin and Sheridan air guns. See the link below for the date of manufacture. ( not all dates are there) See the second link for the scope mounts. Hint: you may find that the scope is too far forward when you mount it because the loading port is in the way of the mount. I placed both mounts on the front tube of the scope so I could get it back far enough for my eye relief. Both rings are on the mounts in front of the loading port so the scope extends back over the loading port. Both scope rings are attached to the front tube of the scope.
Scope mounts that mount on the left side of the receiver using the four screw holes are available from Weaver.
No it's not designed to do so. 2/8/13; Daisy has just come out with a Scope mount for the Red Ryder. Go to the Daisy home page and click on Museum at the bottom of the page. You will find it there. It cost $15 + $5 more for a scope.
Savage 325c rear peep?
You need a Weaver Side Mount #2 (which is the base). Weaver also make 1" side mount rings that mount onto this base. That's what I have on my .222 Savage 340.