I think it's too big for that, but I could be wrong. If it was straightened out it would be 5 or 6 inches acrossBridle rosetteView attachment 1549315
I think it's brass, because I tried to straighten it without harming it and it is really hard. Here are some more pictures.View attachment 1549334View attachment 1549335
What a great ID! And a very interesting read. Thanks so much creskol. I'll mark this solved.I am pretty certain it is zinc, and what you have is an old therapeutic equestrian zinc collar pad,invented by Dexter Curtis in 1870 who later patented it under the Zinc Collar Pad Company on May 14t, 1872 and renewed the patent again on Feb 8, 1881.
Here is a brief on the company history: https://en.wikipedia.org/wiki/Zinc_Collar_Pad_Company_Building
Her is a very interesting and educational article: https://www.ancestry.com/boards/surnames.curtis/2854/mb.ashx