These are called a "gaff knife", or a "fisherman's knife".
I don't know what Kabar called theirs, but I remember the model number was something like T33.
Western's model number was 319, and made from 1936 to 1941. They called it a fisherman's knife.
Since Kabar is in italics, that means yours was made sometime after 1952. If there is no model number, the latest it would have been made is 1965. My guess is the earlier half of that time frame.