James Polk, George Dallas token

Any idea about the age of these and if they are of any value?

These are two identical coin-like tokens, about 1 5/8” across, made of some sort of pot metal (possibly a lead alloy?) and tied together with some string that appears to be a natural fiber (cotton?). – One side depicts James K. Polk and the other side shows George M. Dallas. I know Polk was US president 1845-1849, and Dallas was his vice president.

These were among items belonging to an elderly, now deceased relative. I assume these items are old based on their composition, but I’m not about to say they go all the way back to the Polk election without other evidence.