Anybody know what these are?

[Emperor Oli 0]

The first has been made into a brooch, the reverse is dated 1814, and looks like it has been overstruck on another coin. I'll upload the othersin subsequent posts. I have a feeling that they're Brazilian, probably because of the "B" in the middle of the brooch.

[Emperor Oli 0]

The overstruck circle on the first picture (rev or obv?!) seems to be struck over the same globe-like thing on the above brooch. I can't see a date on this one

[Emperor Oli 0]

This is the last one. All of them display the globe thing as on the brooch. As said earlier, I think they're brazilian, can anybody help?