This one is a smoke show. Very good one here, and an example of earlier use of  Westinghouse Ivorite.  Standard shaped handle  probably from the mid/late 70’s.  The Model “B” sheath really sets this one apart, as it was not commonly selected when ordering back in the day. This example is just about as good as it gets for the period.  They don’t show up too often like this example, and the condition? Mint!!