Model of engine at the Cosmos Pavilion in VVC (All Russian Exhibition Centre).
Vostok Rocket Engine RD-107. I had titled this "Satellite Booster?" while I tried to track it down. I thought this model currently resides at Memorial Museum of Astronautics (<a href="http://www.space-museum.ru/">link</a>), but a picture of it on Wikipedia says that it's now at the Museum of Space and Missile Technology in St. Petersburg (<a href="http://ru.wikipedia.org/wiki/%d0%a4%d0%b0%d0%b9%d0%bb:RD-107_Vostok.jpg">link</a>).
Photo by my grandfather David C. Cook. Scanned from an unlabeled Kodachrome slide, datestamped June 1969. Photo W4 3 11, in an unlabeled slide cartridge.