I also recognize some of those horse harness buckles. The stamped out type must have been pretty popular (or inexpensive). Found a couple of the same one you have in the bottom pic, above the GM keys. Dated them to the late 1800's. I recognize seeing most of those other buckles too. The ones that throw me a bit are the very thin pear shaped (bottom pic, far left). I think those are bra shoulder adjustment clips from around the 1940's maybe?
The opaque glass jar lids in the third pic are really cool. Wish I knew what the whole jar looked like! I found one like that at my first detecting site this past spring amid the silver dime spill. I can only assume there must have been a jar full of dimes in the house (wall, floor?) when it came down causing the spill. I never could locate the rest of the jar.