Sounds a bit high for our area (I live in Va.) by about $100 unless in it is NIB. Offer 25%less as starting point. Factory nickel should have the N stamping on barrel, frame and cylinder. I agree with DocB that a matching box, papers and tools (and grips matched) add $100.
Model 10's are rugged, dependable and great revolvers I carried one in the 1970's as a LEO.
For comparison: Recently I bought a 10-7 nickel, 4", pinned barrell without box, tools, papers for $300 early morning at a gun show. (Grips were correct but not numbered to the gun.) I feel I got a great deal! The nickel had some minor scrtaches from holster wear, a little dull in places and it needed a good cleaning. It appeared it may have been a police carry at one time but was in excellent condition overall. Here is a picture after cleaning and a light nickel polish with Flitz.