✅ SOLVED 2” round brass, copper buckle type thing?

[cmthunder]

Found these 2items 5’ apart at Civil War Union camp farm in Western Md. The place has been hit hard over years not much left.
2” round brass I think with iron on back has part of attachment maybe lead? Is this horse rosette?
Second item I think is copper , greenish and silver color. Buckle?

 

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[creskol]

The round item is a bridle rosette. The other is a part of a harness buckle, and I think it went to the harness saddle. I forget the name of it, but I will think of it eventually.