Magnetite sphere
The spheres like it were found in 1927 in the place of Tunguska event by the Soviet expedition. The main proof that Tunguska phenomenon had the cosmic origin. There are more than 70 different explanations of Tunguska event and most of them don’t mention the spheres (v. Freedom of Speech).
S-97 Movie Camera
It belongs to Alexey Leonov, Soviet cosmonaut, the first human to conduct a space walk. It worked for three minutes only, but it DID work! Ironically this movie camera is always mentioned together with mini photo camera “Ajax” that didn’t work. S-97 is a classified device so its real look is unknown.
Belka and Strelka dog-collars
Exhibited in Memorial Museum of Astronautics, Moscow. The symbol of incredible luck in an extremely dangerous and complex situation. Ones of the most powerful space artifacts out there.
Yuri Gagarin's helmet
There are several museums and private collectors claiming they own the genuine helmet of the first man in space. However, apparently, the true artifact’s location is unknown. There are conspiracy theories that believe the country that has it should visibly lead the space industry.
Lunokhod-1 the Lunar Rover
One of the peaks of Soviet space program. Delivered to the Moon in November 1970. The mission ended in October of 1971. It has a tub-like compartment with a large convex lid and eight independently powered wheels. Equipped, among other things, with television cameras, telescope and a laser positioning device.