The Wallace Collection, one of the best private collections of art in London. They have an especially good arms and armor gallery. It's well worth checking out if you're in London.
On the top we have, according to the signage, "a mace of the morning star type, damascened in gold with arabesques and emblematical figures within cartouches of silver piqué." Well that clears that up. It's from Milan c.1560.
Below are some fine parade helmets from the same century, also made in Italy and of the type known as "antique armor", which imitated the styles of parade armor from ancient Rome.