This model of the Proton hung inside the Cosmos Pavilion of the All-Russia Exhibition Centre. In the background, a Kosmos rocket and Vostok space craft are visible. Proton-1 and Proton-2 were identical satellites with identical scientific payloads. Here's <a href="http://imagine.gsfc.nasa.gov/docs/sats_n_data/missions/proton.html">a bit about them from NASA</a>.
Photo by my grandfather David C. Cook. Scanned from an unlabeled Kodachrome slide, dates tamped June 1969. Slide W4 9, in an unlabeled slide cartridge.