Heinrich,
I've included three more pictures. The first, is the left frame you requested. The second is inside the grips behind the trigger guard and the third (and, I think, most revealing) is the bottom of the butt. The photography shows up things I missed with my naked eyes. You can see the difference in the bluing and the remnants of what appear to be two numbers, "2" and "5". Looks to me now like the lanyard ring has been machined off at some point. It may even be worse than that, but I'll let someone else call that one. Oh, yeah, there is a crown over the script letter "f" or "ff"(I think) on the bottom of the frame in front of the cylinder. I could not get a decent (in focus) picture of it, sorry.
Thanks for the help,
Ken
Download Attachment:

94.72KB
Download Attachment:

75.77KB
Download Attachment:

73.32KB