A US Navy tinned Mark V 12-bolt diving helmet by 'Morse Diving Inc' - Rockland Massachusetts founded in 1837. Serial number 2033 all matching and dated 8  02. Oval top window with guard and comms cup to the right hand side, circular side windows with guards and hinged front window with guard. Spitcock to the lower right, outlet valve with banana exhaust, rear air inlet and comms inlet with cap and breast plate with hanging eyes.