Watches were first made to know the time of the day. Mr. Henlein received 15 florins for a gilt musk apple with a watch. It was the first in the history of watches in 1524. After the 1600s the manufacturers used precious metals in the production of watches. They used colored enamels in the decoration of covers of watches and cases. In 1620 the glass crystal was used in the cases around the watch. The . . .