Yes, the backstrap and trigger guard are indeed silver plated. Photographing this gun is tricky in that too much light results in reflection, which you definitely don't want with metal surfaces, I still haven't gotten the right picture of this one yet but when I do I'll post a couple.
Regarding your trigger guard and backstrap- what are they made of ? What I mean is, is it possible to strip off the brass to reveal some other metal beneath ? I don't know if I'm making myself clear but I got mine aged as you see it. When examining the bottom of the grip strap where they applied some kind of bluing agent. I was considering removing this applied finish, but as I look carefully at a small wear point I think I see an almost copper colored metal.
Are the brass parts, brass ? Or something else ?
If I try to remove this blued finish I don't want to be left with a copper colored backstrap!