Kosmos 782 was a Bion satellite. It carried 14 experiments prepared by seven countries in all, with participation from scientists in France, Czechoslovakia, Hungary, Poland, Romania, United States and the Soviet Union.
On display at the Moscow Space Museum, the circular viewport was installed for display purposes.
The Bion satellites, also named Biocosmos, is a series of Soviet biosatellites focused on space medicine.
A Bion spacecraft, on display
An artist's concept of a Bion satellite in orbit