Interesting... I have the hammer spring, and it functions correctly, or so it seems. I suspect that the spring is just not installed correctly to return the trigger. FWIW, I had it apart to fix this problem, but couldn't see anything wrong. I cleaned it all up and put it back together, and it has the same problem.
As far as condition, it's actually in very good condition, and the grips are mint. It appears to have no broken parts, though the hammer extension is a little beat up from idiots dry-firing it.
I have an older Gun Parts Catalog, and I can't find it under either listing, that's one of the first places I looked. I've also been unsuccessful with an Internet search. What I'd really like to have is an exploded diagram. Knowing that the hammer spring also does the trigger, I guess I'll take another look and see if I can get it installed properly.
As far as ammo, I probably won't try firing it, but I'm kinda' picky about anything that I have being complete and operational.
Thanks for the info, I'll have another go at it...