Mike;
The screw end visable above & forward of the plate cross screw is the screw the sear is hung from. The low one in the rear of the plate is the sear engagement adjustment screw. During this time it was slotted on the inside, so the plate had to be removed to make adjustment. The hammer axle goes through the rear lower part of the frame, so if it has the turned ends they would appear as small pins in the lower portion of the plates just forward of where the stock meets the frame. Only one I have with this feature is a G SN 20,633. This is also the only one I have with the two pins in extractor.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra