Well, there can also be occasional confusion as to which medallions go with certain time frames. This was because as vendors changes or design changes happened,, there was an "overlapping" of types used.
Chad Hiddleson (RENE) also has an older book on the .22 Semi-autos, that has a lot of good info on medallions. The medallions were the same,, in general, for the auto's and the SA's.
But very basic info;
First ones,, recessed phoenix,, that was colored red. Silver outer perimeter. 1949 to early 1952. Semi's only.
Same shape,, phoenix color change to black. Neck shape considered "skinny."
Later on, the neck shape is a little "fatter."
1967 in general,, a medallion was used that has "neck feathers."
1972-ish,, the phoenix was changed. It became raised,, colored silver, and has the SR in the center. The recessed area is black.
And sue to vendors,, there is a difference in what appears to be a "squashed chickens" and a clear sharp phoenix.