I believe the vessel on the left is a model of Venera 5, which launched in early 1969. To its right -- based on the solar panels -- is a Venera 2. Up to the right is a Proton probe.
Seen in the Cosmos Pavilion of the All-Russian Exhibition Centre.
Photo by my grandfather David C. Cook. Scanned from an unlabeled Kodachrome slide, datestamped June 1969. Slide W4 7 , in an unlabeled slide cartridge.