The metal was (generally) parkerized. Some parts were blued depending on maker. The wood should be oil finished - usually it was dipped in boiling linseed oilicon and left to hang-dry at thefactory. This can be replicated by hand-rubbing boiled linseed oilicon into the wood.

DON'T BOIL RAW LINSEED OIL!!! IT WILL CATCH FIRE! "Boiled Linseed Oil" is sold that way - raw linseed with drying agents added.