If the size is confirmed as being small (coin size for round item and an inch or so for the other) they are probably leather related items. The long brass (if it's brass) item is sometimes found along with another brass piece that slid into/underneath your 'bracket' item. like a strap/belt tip.
Also, the similar items that I've found here in PA came from sites that dated from the late 1700's to early 1800's. Some are ornate like the one you found, and others are just plain brass.
The round object appears to have "tabs" that would fold down to affix it to something like leather or a fabric item maybe? Is that writing or some type of graphic on the backside of the other item? Hope you can get an ID. Nice finds.