This is a very nice example of a pre WWI sweetheart brooch. They used a real coin from 1888 picturing the Kaiser. The coin was smoothed out the back so that it could be engraved, but they never did engrave it. This would be a lovely gift for someone, especially if you had it engraved to them. It has the old Victorian-style C-catch on the back, with the German military barrel hinge that they used for decades. Measures 1 1/8" in diameter.