This is a kit model of a Lafayette class submarine  in 1250 scale made by Mountford Models in metal. This class was part of the USN Cold War response and a development from the Ethan Allen class. Length 130m 425ft Beam 10m 33ft   Displacement 8245 tonnes. Crew 140 Top speed 21knots,This is about 3.5 inches or 100mm long. ref MM311KIT