Button questions plus this other thing

[xcopperstax]

I believe this to be a Civil war button. Can anyone confirm or deny it? The back mark is Waterbury button co.
The next button is Navy as far as I can tell with a back mark of Superior Quality can anyone give any idea on dating this one? I know about the 1850-1941 but was hoping for more specific.

Last item looks like a writing instrument but I don’t know what it is. It looks to be cast. It reminds me of charcoal but it seems too heavy to be that.

Thanks for looking and thinking!

 

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[Vermont treasure hunter]

The frost one is a civil war Calvary button. See the C on the eagle shield? Not sure about the other one.

 

[How Lucky]

Graphite core to an old battery.

 

[devldog]

Great save on the Cavalry and the Navy button.