This is made of thin brass it has very crude rivets. The area I'm detecting has been a river crossing since the early 1700s. The other item is also very thin brass but it is oval and has a spot it looks to small to be a canteen. It has been flattened.
This is some of the other things I've found I need id on. The iron item I believe to be something that might have been used to hold something above a camp fire. The round thing is heavy brass about 2" in diameter and concaved on one side. The buckle is brass need a date on it.