Several other countries have issued platinum coins, but only as bullion coins. These coins are considered serial because the design of the reverse and obverse is the same or similar for all the coins of a given year. In addition to similarities in design, these coins are combined in the series because they are issued annually for a period of time. For example, the Platinum Panda was produced from 1987 to 2005, and the American Platinum Eagle from 1997 to 2008.