I have a bell and I have been giving it. I have been doing so much research and still not sure what I have. Possibly a railroad bell or a school bell? I would love to just have a little help with it and know what i have and maybe a ballpark figure. I found out across the whole piece its 12-12.5 inches the bell itself is 8-8.5 inches… On the bottom of the frame it has 4 bolt holes and also says made in USA and has to U’s one on each side also a stamp saying M. Iron please help me out and thank you so much.