Skylab I, II, and III Unflown Robbins Silver Medallions, Serial Numbers 239, 184, and 151, from the collection of astronaut Charles M. Duke, Jr. 35mm, with the mission dates engraved on the reverse. These medallions, though not flown, were made to commemorate the three Skylab endeavors, three of the longest missions flown by NASA through 1973.

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