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One (or more) of the astronauts from the flight crew worked directly with the Robbins Company to design the mission medallion. The basic elements of the medallion design are consistent throughout the Project Apollo series. The main design element along with the mission name is located on the obverse. The names of the flight crew can be found on either the obverse or reverse. The mission dates are located on the reverse. Beginning with Apollo 11, special fields were designed for the reverse of the medallion that allowed for engraved dates of launch, lunar landing, and return. Also on the reverse (or sometimes the edge) is the medallion serial number. The size of most Robbins Apollo medallions falls roughly between a current US quarter () and a Kennedy half dollar ().