A block of 8 stamps issued by the United States in 1981 on space exploration. 8 different designs are depicted, forming one continuous design over the block of 8. The first stamp in the top row shows an astronaut standing on the moon and is inscribed, "Exploring the Moon." the 2nd stamps shows a space shuttle attached to the booster rocket at takeoff, and is inscribed, "Benefitting Mankind." The 3rd stamp, also inscribed, "Benefitting Mankind," depicts a space shuttle in orbit with a bay open with a device (perhaps some kind of scientific measuring instrument?) outside, tethered to the shuttle. The 4th stamp is inscribed, "Understanding the Sun," and shows a spacecraft with the sun shining brightly in the background. The 1st stamp on the bottom row is inscribed, "Probing the Planets," and shows the planet Satuern and the Voyager spacecraft. The 6th stamps, "Inscribed "Benefitting Mankind," Shows a space shuttle being launched, attached to the booster. The 7th stamps, also inscribed, "Benefitting Mankind," shows a space shuttle in orbit around Earth. The last stamp, inscribed,"Comprehending the Universe," shows a satellite in space.
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Another in series of #DesignErrorsOnStamps
Can you spot the error the stamp artist made in the design of one of these stamps?
United States, Scott Nr 1912-1919 (1981)
The answer will be left within a comment by me, later.