I don't know that this QUITE qualifies as jewelry, but it has a CORO JEWELRY hangtag so I'm guessing that it was originally sold as such--it is a keyring, in antique 'silver', with 4 San Francisco charms: Coit tower, a cablecar, a Chinatown landmark (?) and the Golden Gate bridge. The bridge and Coit tower are both an inch long or high. The Coit charm is marked CORO c. In MINT condition, and I'm guessing from the 50s.