I found this in a confederate camp site. The one obviously is a knife tip. But the latch or buckle not sure. It's thick, Iron and I'm not sure what exactly it would have belonged to
It appears to be a link from a machinery chain-belt called a roller-link chain. Compare it with the photos below.
I see your relic-ID equest is your very first post here at Treasurenet. As you'll see if you stick around and keep reading the What-Is-It? forum, it is the best place on the internet to get the correct identification of an unknown object.