The cylinder yoke retaining screw is loose in the side plate. I have not tried to address that, and have not taken it out to see if it is intact. There is also some dirt left around that screw. I might not have cleaned in that area well enough. It does not look dished out to me, but there may be something else wrong there.
The screws are not badly buggered, but the slot edges feel sharp, so someone has been in there. Not really shocking after 45 years.
There are scratches on both sides of the hammer, wider and more visible on the right side. I know what a shim is, but I have never done that on revolver.
The bevel at the tip of the ejector rod - that is a new one (I learned something in this thread!). I have a Model 18-4 that shipped the same year (18Kxxxx and 24Kxxxx prefix, respectively, 1977). The tip of the ejector rod on both guns looks identical, blued bevel and all, only the Model 18 finish shows more wear including the shaft of the ejector.