It was identified and I sold it for shipping cost:
It is a First Lieutenants knife. On a Navy the First Lt, is responsible for First or Deck Division. The spike is a Marlinspike which is used to untangle line and is helpful for tying certain knots such as Reef knots and Monkeyfists. I have only seen 2 that nice, both belonged to Senior officers of Her Royal Majesty's Navy. I have seen some nicer than average given as gifts to officers who transfer or are reassigned as recognition for being a fairly decent officer. We made mugs and steins out of 5in powder cases for much the same reason.
Regular Bosun's are issued a similar knife, but it's not nearly that pretty.