I was afraid I had been overly generous on that value after I had posted it. Wild Turkey 101 can do that, but $800-$900 sounds pretty hard.
JR
It's been my experience that how much one can get for a nice shotgun is strongly influenced by how fast the seller wants to sell the item. And Ted is right on target with his comment that doubles are not the hot items they were a decade ago. I'm watching a nice Arrieta 12 gauge on Gun Broker that is currently at about $750 with seven days to go until the auction closes. I'm also watching a 20 gauge DIARM/Sarriugarte sidelock that is at about $400 with seven days until the auction closes. Both would tempt me at under a $1,000, nether at more than that.
All that said I think the present owner could realize somewhere around $3000 for the gun if he was able and willing to wait for the right buyer.