Thought it was a copper but found a cool piece of history, an 1860 campaign pendant for the the candidacy of John Breckenridge/Joseph Lane for president in 1860. Not much to look at, but clear enough to make out the names.
The middle was apparently a photo/likeness of each candidate made from some sort of iron compound, so it is totally toast.
Here is an unabused look at what the pendant looked like back in the day.
Also found a “heads I win” “tails you lose” coin. Its NC-17 rated; who knew these things existed (I didn’t)? I couldn’t find how far back these go, but given its toasted condition and that it was found near the 1860 pendant, it could be 150+ years old. The oldest I could find online was from the 1960s, but no way a coin that young would be this toasted.
Also found a sterling ring.