I dig up early spanish items on some of middens I visit. It's mostly bits of metal and glass, but occasionally beads, tools, buckles, etc.
If you go back to the listing of forums there is one called Fur Trade Artifacts. Fur trade items from Canada can be late 1880's & 1890's (maybe later), where as in Eastern US, Midwest and Southeast trade relics might not have been specifically associated with furs and can be almost 400 years older.