Ave!
Key Ring, circa 1st-2nd Cent AD
Copper alloy; 33mm/6.8gm
Con/ about As Cast; remarkable and eye-pleasing green patina; cleaned and waxed.
A truly wonderful example of a key-ring that was used to keep things secret and safe by well-to-do ancient Romans.
Such key rings were worn on a chain or strap about the neck, but if you are so inclined, it's a ring size 8 1/4. :-)