An Old Circular Bird Trap.
Made from iron and brass. Size 7″ inches.
This type of trap was place on top of a fence post to catch birds when they came down to land. One would set the jaws and engage the catch plate, when the bird came to land on the plate it would release the spring and jaws to trap the bird.
This type of circular bird trap had a few different sizes, the smallest and most valuable being the 3″ inch version.