Good eye Hondo, you caught me!

They are not the original grips. The gun came with square butt conversion target grips. The grips you see I bought from another member of this forum. The medallions have a slight curve to them and are non magnetic.
The serial number stamped on the grip is 284766. My gun is a 4 screw, serial number 216xx, which from what I can gather, dates it to around 1955. I have a possible lead on where the originals are but haven't checked it out yet.