I inspected the piece this morning...and bought it for $375. I found four serial numbers, all matching. There are three acceptance stamps behind the rear sight (crown, crown, U) and one in front that I cannot suss out. I'll try to match it to something in the proof mark documents on the interwebz. Holster is vintage but no stamps or marks except for four handwritten letters under the flap that I cannot decipher. I'm guessing it's a any-32 holster. It's had a repair, one of the belt loops had to be reattached.
Overall I think the gun looks very nice. Better bluing retention on the left than the right. Barrel is very clean if a bit dull in color. Grip has some wear but no cracks, just a few small gouges on the butt. Magazine does have surface rust but no pitting. Some freckling under the trigger guard and on the back of the slide around the cocking indicator.
I will try to get some decent photos if there is any interest. I will strip, lube (with Ballistol, natürlich) and then she goes to the range for some light exercise.
My thanks for the information exchange. A nice introduction to the board and some of it's inmates.