That's not a lot to go on, but it is a U.S. Model 1898 Rifle, made around 1899/1900 (don't have my books at hand, but I know that 200722 is 1899) and what you have shown appears to be perfectly proper.

Value: $600-800 from what I see - that could go down (significantly) or up (a little) depending on what the rest of the gun looks like.

Bayonets, with scabbard, are around $150-$200, with slings around $100. The bayonets are dated, so you want one that matches - neither date is "rare", so that should not be a problem.

Check out   (You need to Login and search for "Krag". you'll get about 7 pages of stuff.