Here's my 640-1 from Centerfire. The tracking number said that it would be delivered on the 3rd, but it showed up early. Like others, the gun was filthy. The front sight has a couple small dings, so I plan to file the peened areas smooth and cold blue it. I soaked the insides of the gun in Kroil, then blasted it out with Gun Srcubber and then lubed. I didn't take off the side plate, but will soon. Gun had a grungy, oxidized appearance, so I lightly flitzed it. Also flitzed some freckles and discoloration from the trigger.
I notice that mine has the newer style cylinder release latch. Most look like they have the older style.