The cup or mug measures 3-3/4'' tall. It appears to be in mint unused condition as pictured.
Below here, for reference, is some information about the U.S.S. Memphis SSN-691:
U.S.S. Memphis (SSN-691)
From Wikipedia, the free encyclopedia
Namesake: The City of Memphis, Tennessee
Awarded: 4 February 1971
Builder: Newport News Shipbuilding
Laid down: 23 June 1973
Launched: 3 April 1976
Sponsored by: Mrs. Cathy Beard
Commissioned: 17 December 1977
Decommissioned: 1 April 2011
Class and type: Los Angeles class submarine
Displacement: 5,716 tons light, 6,087 tons full, 371 tons dead
Length: 110.3 m (361 feet 11 inches)
Beam: 10 m (32 feet 10 inches)
Draft: 9.4 m (30 feet 10 inches)
Propulsion: S6G nuclear reactor, 2 turbines, 35,000 hp (26 MW), 1 auxiliary motor 325 hp (242 kW), 1 shaft
Speed: 15 knots (28 km/h) surfaced, 32 knots (59 km/h) submerged
Test depth: 290 m (950 feet)
Complement: 12 Officers; 98 Enlisted
Armament: 4 - 21 inch (533 mm) bow tubes
The U.S.S. Memphis (SSN-691), a Los Angeles class submarine, was the sixth ship of the United States Navy to be named for Memphis, Tennessee. The contract to build her was awarded to Newport News Shipbuilding and Dry Dock Company in Newport News, Virginia on 4 February 1971 and her keel was laid down on 23 June 1973. She was launched on 3 April 1976 sponsored by Mrs. Cathy Beard, and commissioned on 17 December 1977, with Commander G. Dennis Hicks in command.
In March 1981, Memphis completed an around the world cruise via the Panama Canal, including operations with both the Sixth and Seventh Fleets.
Memphis was re-designated an experimental submarine during 1989 to test composite hull structures, unmanned underwater vehicles, advanced sonars, hull friction reduction, and other advanced technologies for the Los Angeles and Seawolf classes, but remained combat capable.
During a mid 1990s refit, Memphis received numerous modifications, which added about 50 tons to her displacement, most of it aft. A glass reinforced plastic (GRP) turtleback abaft the sail to accommodate remotely operated vehicles, a towing winch and drum for experimental towed sonar arrays 4.27 m-high by 1.37 m-wide vertical surfaces at the ends of the stern stabilizers to accommodate sonar transducer arrays a 54 mm towed array dispenser in the port fin leading to the new winch abaft the sail supports for the stern stabilizers, new hydraulic systems, a fiber optic databus, 58 standardized equipment racks to accommodate electronic test gear
In January 1994 Memphis entered Portsmouth Naval Shipyard for refueling, overhaul and modifications to support her research and development role. Upon completion of the shipyard availability she was assigned to Submarine Development Squadron 12 in Groton, Connecticut.
In 1998 Memphis tested the Lockheed Martin Undersea Systems Universal Gravity Module (UGM) passive bottom profiler navigational system.
On 3 May 2005, Memphis deployed conducting two polar transits, returning to New London on 3 November 2005. Memphis won the coveted Battenberg Cup in 2005, as well as the Squadron 12 Battle E. On 6 May 2006, Memphis deployed against Iraqi insurgency, returning to New London, Connecticut, on 7 August. On 27 June 2007, Memphis returned to Portsmouth Naval Shipyard in Kittery, Maine, for a Pre-Inactivation Restricted Availability. She returned to Groton on 8 May 2008.
After 33 years of service Memphis was taken out of service in a decommissioning ceremony at the Shepherd of the Sea Chapel located at the U.S. Submarine Base in Groton, Connecticut on 1 April 2011. Memphis went to the Portsmouth Naval Shipyard to begin the inactivation process. Parts from the decommissioned Memphis were to be used to repair the damaged U.S.S. Miami, until the decision to cease work on Miami was made in August 2013.