This is the right side of the QSL card from the Voyager 2 Encounter with Neptune. The image on the QSL card is of Neptune’s large satellite Triton during the close flyby of Voyager 2 on August 25, 1989.
This is the left side of the same QSL card showing Neptune and the Great Dark Spot with its bright white companion (slightly below and to the left) known as Scooter.
The images above are from the rear side of the Voyager 2 Neptune Encounter QSL card. See the October, 1989, issue of “W6VIO Calling” for the recap of this special event. Then checkout the NASA Voyager 2 Mission web page for more detailed information and the NSSDC Neptune Photo Gallery for many high quality images taken during the encounter.