I think the Quadrant (spelling?) shifter on the down tubes is from the 1930s. Nice catch. It would have been a shame for that bike to have survived this long just to me smelted down. Be careful in the method you use on cleaning the chrome parts (a few postings here on BF on "how to" ). Black is a pretty easy color to deal with. Post some "after" pix. Should be a fun project.