DGW has made an excellent observation. I blew up the pictures in post #25 & post #28,, and the silver eagle, with the hard R, DOES appear to have small neck feathers.
Over the decades,, as noted,, there have been different shapes of the grip medallion phoenix's (or eagles) as we call them.
Yes,,,, they were labeled as a phoenix,, but people being people,, started calling them eagles as well.
We call the early ones, "Red Eagles," for the original Standard Auto pistol before the color change in early 1952 to black. And in the early years,, up until the early 1970's,, they were all a recessed phoenix,, and the it was black. there are a few variations within this type too.
In the early 70's, there was a transition from a recessed phoenix, to a raised one,, colored silver, AND it had the SR in the chest area. There have been variations of this design as well.
Then we have the switch to the hard "R" from the SR in the chest area.
And next,, we got some guns,, that Ruger built to re-create the desired XR3 g/f, and they returned to the recessed phoenix, and painted it black.
Throw in the molded in the plastic oval shaped medallion,, and a few others, & we have several variations of the phoenix.
And let's not forget the Bearcat medallions, or the Red Label medallions,, which are also different.
Confused yet???