Prices are all over the place. I got one (blued) in very good condition for less than $400 a little over a year ago, but thought I had made a pretty good deal. I bought a really rough one for less than $100.

Not knowing how it is mechanically, I'd just take a shot and say between $250 and $300. But, I'm sure other experts will be by shortly. (And I usually underestimate what values are!)

And welcome to the forum.