Unknown brass and iron piece

[boggsc71]

Found this in a Calvary camp near Winchester Va. It seems to be made from mostly brass with iron attached to one side. It's 1.25" wide.

 

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[gwdigger]

Looks like a rosette / bit boss from here.

 

[Beshires1]

Could be a powder flask cap. If it has a iron rivet attached to one side , it could have been the pivot point to open the flask for refilling.

 

[DirtyMike&Tab]

Maybe an apocrathy weight.