CWL-837 WWII Navy tube??

Alright kids, here's a trip down mammary, er, memory lane. Found this mint NOS tube in it's original US Navy box (dated 10/42) and haven't a clue what flavor it is.....am guessing it's probably some sort of power tube for a transceiver or radar/sonar gear. Anyone know? Is this something the audio guys can use?

Anthony