Baltic Shipyard
Initial plans called for 35 submarines of this class. In fact only 16 were actually built, two - including the lead sub, by the Baltic Shipyard, St. Petersburg and the rest by the Krasnoye Sormovo Shipyard in Nizhny Novgorod. They were commissioned between 1963 and 1968, and served through the 1980s. The last one was decommissioned in 1994.