There are many types of Ike dollars including proofs, mint sets, bicentennial year Ike dollar, toning and more! Proofs are coins with special finishes and are not released in circulation. There are also silver proofs which are made out of ninety percent silver! Some coins have artificial toning and some are naturally toned! There are also mint sets for the Ike dollar which were sold in blue seals with information about the Ike dollar. The bicentennial year celebrates the landing of Apollo 11 with an eagle on it. Shoutout to all the Apollo 11 crew! The designer for the bicentennial reverse was Dennis R. Williams, he also won a $5,000 cash reward!There are also many error coins like the no S mint mark proof.