Button help. 2 piece and button or bale seal?

[skateandcreate]

Couple what's it's. Anyone seen these designs? The lead or pewter one has a single nub on the back. Two piece is very ate up.

 

[skateandcreate]

More pics and size ref.

 

[skateandcreate]

The one looks to be lead I believe. Dunno if it's a button or bale seal. Has a shank looks like

 

[CRUSADER]

Doesn't look button or bale seal. So no idea