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It looks to have been refinished which lowers the collector value. Also the big hole in the butt stock is not factory and I presume for a sling? The rear sight is missing the elevator screw. Despite theses issues and depending on the condition of the barrel it should be around $500 on the EE and at auction perhaps quite a bit more but then you have to contend with auction fees so you're back +/-$500
A gentle cleaning along with correcting two minor cosmetic issues should add some value (perhaps another $75)
It's hard to tell from the photos but it looks like a nice shooter.
I remember these being shooting gallery guns at county fairs, I presume firing shorts or CB shorts. Maybe the hole in the stock was to attach something to make sure the rifle didn't disappear down the midway?
The serial number is also on the inside of the upper & lower receivers as well on the pump handle, there's usually a partial serial number on the inside of the butt plate.
In later models it's on the underside of the barrel in front of the magazine tube.
Gallery guns usually had a metal fitting for the chain in front of the pump handle