I have that exact gun, & agree that it would probably bring over
$1000, even with a somewhat unpopular barrel length. But who knows in the volatile market with which we have to deal.
When I bought my 629-3 DX, I knew that those round butt grips would have to go. In my view they make no sense at all on such a long-barreled, heavy gun. I got a pair of round to square conversion grips from Nill in Germany. With those I can maintain a firm grip, without the thing wanting to slip downward on me.
Best wishes with your new gun.
Andy