All of the O-110s have the XXX edge, this one is actually the prime version of the O-110 before the damage to the reverse die...probably an R-6+ rarity.
Coronation medal in silver struck by Nicholas Briot and distributed by King Charles I to attendees to his Scottish coronation on 18 June 1633. There are a couple of gold examples of this medal and one is known to have been kept as a pocket piece by the king.
I guess this counts, it's silver, it's a coin, and it's dark. Technically probably considered jewelry ???