Horse jewelry, machine parts, etc

[Blackfoot58]

We hit the mother lode this afternoon (my wife ran the shovel for a while). Some horse rigging items that were new to my find list. A heavy iron hitch bar, a metal strap with a gear attached, another J-hook, some old leather straps (rotten) were found with the small item on the lower left.
There is one piece of harness leather with 4 brass rivets. All 4 appear to have flower designs on the heads. This seems to be normal at this location. Will clean them and post better pics. Thanks for any input