United States Skylab 4 (SL-4) mission cover, canceled Kennedy Space Center, November 16, 1973, launch day for the third and final Skylab crewed mission.

Blue launch-tower cachet names the SL-4 crew Gerald P. Carr, Edward G. Gibson, and William R. Pogue, tying a major human-spaceflight milestone to a science-themed U.S. commemorative.