Your new addition was made in 1980. My price guide says your gun should be worth $400.00 in excellent condition. The less common nickel finish might add a little to that. This should happen to you more often.
Idaho has much more reasonable prices at their shows than Warshington does. We have too much of the "it's a gun, I can MAKE a lot of money on it" attititude. Too many guys on "the circuit" with the same old stuff too.