I found all of these buckles the same place I found my Union, Civil war button. They are not heavy duty. The one that is by itself says R M Co. Pat March 7 1871. I would think they could be from overhaul straps maybe. Any help will be appreciated.
Yes Maggie those are all Suspender buckles.I call em "Ring",style because they utilized a brass ring that would hook onto the tabs you see on your pieces.