I am no expert but I will give it a shot.

All matching numbers, all original (grips, box, papers), excellent bore, I'd say it may be over priced.

Unless it is something special, and seller can prove it.

Age, condition and markings with determin value. I've seen a lot of these, and most people think they are worth 2x their actual value.

There are a lot of them out there for sale.

post pics of the bottom of the grip and the crane marking and someone here with break out the correct book and give you a fair value.

Of course, I have over paid for a gun I had to have, my Marlin 1894/357, new old stock, is my best example of my buying with my heart and not my head. (paid $900, could have searched more and paid $700 if I was willing to wait)