Ka Bar made the Mk 2 combat knife along with several other manufacturers during WW2. After the war Ka Bar didn’t make this knife again until about 1975 as a commemorative.
I have one of those knives and unfortunately your’s looks a lot like mine.
Your knife has what is called a (thick pommel). On a WW2 Ka Bar with a thick pommel the tang will be “peened” down on to the pommel to hold the handle together.
All the post WW2 Ka Bar Mk2 knives I’ve seen have been assembled with what is called a “blind pin”. A hole is drilled into the side of the pommel and into the tang. But it doesn’t go through the other side of the pommel. When the pin is driven into the pommel you won’t see it protrude thru the other side of the pommel.
On the WW2 Ka Bar’s that were assembled with a tang pin The pommel would be thinner than the one in the pictures and you could see the end of the pin on both sides of the pommel (thru pin). As opposed to a (blind pin).