Kosmos 111, E-6S No.204, was the first Soviet attempt to orbit a spacecraft around the Moon. The design was similar to the future successful Luna 10 spacecraft. Kosmos 111 was produced in less than a month, one of two spacecraft developed from the E-6 lander bus in a crash program to upstage America's Lunar Orbiter series and to commemorate the 23rd Congress of the Communist Party of the Soviet Union (CPSU), held in March 1966. Kosmos 111 was designated an E-6S spacecraft, consisting of an E-6 bus attached to a cylindrical pressurized 245 kg lunar orbiter module. It was 1.5 metres (4.9 ft) tall and 75 centimetres (2.46 ft) in diameter at the base.

Wikipedia: https://en.wikipedia.org/wiki/Kosmos_111. Original timeline Wikipedia link: https://en.wikipedia.org/wiki/Cosmos_program. Related NASA reference: https://nssdc.gsfc.nasa.gov/planetary/chronology.html#1966. Description adapted from Wikipedia contributors (CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/).