The key ID-clue for the bell is its attachment-form... whose upper half is broken off. Note that it is shaped like a vertical short flat board with a single small hole drilled through it, for a short straight iron wire which held the bell in place on a frame, along with several other identical bells. The photos below show how that worked. It is called Hames-Bell. The blue writing on the horse-team photos calls attention to the bells on the Hames of each horse. They were often used on a Conestoga wagon team, but were also often used on other draft-horse teams... and also buggies, etc. Note the photo below showing a single mule harnessed with Hames-Bells.
Most of the examples of this type of Hames-Bells that I've seen are made of White Tombac, though some are the usual yellow brass alloy. Being White Tombac indicates they can date back at least as far as the very-early 1800s.