Thanks for your comments.
By "fair condition" I mean it looks much like the illustration on page 52 of the SCSW, second picture down under "fair". Most of the bluing at the muzzle is gone, tapering to mostly there at the frame. There are a couple of rust spots on the hammer. The bore and rifling look crisp and shiny with a cursory look.
Looking at the butt of the gun, the round butt of the frame curves away from the square outside corner of the stocks, leaving them unsupported. I didn't ask to remove them to look closer.
I believe the rear sight is factory, but I'm used to the post war sights. This one has tiny screws that would require a jeweler's screwdriver. The windage adjustment has a screw on each side, as if they were opposing: loosen one and tighten the other. The elevation screw is also very small. There is no sign of "butchery" machining - if it's a replacement, it's very well done.
I believe it is a 2nd change because it has the barrel lug at the forward end of the ejector rod.
I'll look at it again tomorrow, hopefully it's still there.
Thanks again for your comments.
Walt