Bi-Metallic medallions were probably given out as a new years eve gifts and they go back to the 1st century. I know one of Nero http://www.forumancientcoins.com/board/index.php?topic=88596.0
Yeah, medallions usually start at Porsche 911 turbo money, and peak at penthouses in Miami Beach type of money, depending on the rarity. If I had that kind of money I definitely know what I'd buy....the penthouse. I can always admire the coin from my computer at the penthouse before going for a dip at the beach. A man can always dream, can't he?