Hi to all and many thanks for the replies... Heinz, that is an excellent site and a good lead to answers to my questions... And Policeluger, it's alway good to have you in on the hunt!

Thomas, I think you are close, but I believe the yellow tint is most likely tin, and the flaking finish, nickel... I would be suprised if cad. was used this early, for that application, but it could be... ?? To be more specific:
I'm trying to determine the hardness and material best suited for all the pins in a Luger, and there are quite a few!
1) breechblock pin
2) middle toggle pin & retainer pin
3) rear main toggle pin
4) safety lever pin
5) connecting link pin
6) bellcrank pin
7) searbar plunger pin
8) extractor pin
9) trigger lever pin
And as for the plating..I'm looking to find out what they used for .22 conv. boxes..
1) hinge (I think tin / lead, over copper flash?)
2) screws (not a clue??)
3) latch & catch.. (I think dull tin plate?)
Anyway, that's my quest, and I'm certainly going to keep my nose to the trail... Best to all, til...lat'r...GT