ddean,
Thanks, you are right, I should have explained myself.
We lack a good definitive work on khukuries, and the number of variations, the lack of records, and the general abscence of markings makes it hard to positively identify khukuries in the same sense that we can identify an example of a MKII (Ka-bar) utility knife. But there are general ways to identify a good military knife.
We can look at the shape and see that it is pattern in the form of an M43 khukuri. Then look at the knife to take in the general quality of manufacture. Notice that this example has a manufactured feel to it as it should. The lines and grinds are straight and sharply defined. Even though the design is simple, the quality of the piece is very high. The handle is carved and fitted as it should be, there are no sloppy welds anywhere, and everything about it is well balanced and centered.
Then look at the condition. Look at the color of the steel, the aging of the wood, and sheath. It is very hard to fake real age, you can make a piece look distressed but you can't make it look old. This is one of the reasons collectors like to keep antiques in their original condition. Heavy restoration will remove a key way of authenticating the piece. This piece has the right amount of age (60 years +/-).
We cannot confirm that it has seen combat, and for all we know it has spent the last 60 years as a gardening tool, but in terms of design and manufacture the piece is convincing.
n2s