My USMC Kabar is all chipped to hell. The Finish, not the Blade.
If you got that blade the hard way you will still appreciate the rugged abilty of those Ka-Bars! I still have (whats left) mine. My kids were using mine to feed the livestock we once raise, while out giving hay they dropped it...somewhere, fastforward about 6 years, animals all gone and now I'm mowing what was once pasture, and what do I find? A TREASURE!! My old Ka-Bar, it is rusted a good bit, but still servicable, the leather washer handle was toast, rottted off. I took it apart and plan on redoing it completely, I want to attempt to pull a hamon on the blade if it's possible, then replace the handle with something a little fancier, I've never seen a Marine Ka-Bar in Dress Blues! I'm thinking something like that might be super cool, with a much better guard, I want to incorporate the guard and pommel in the new build somehow, the pommel I can use, the guard is not so easy since it's so flimsy and I want something a bit tougher. We'll see what happens once I get it going, too many irons in the fire right now, but I do keep looking at it everyday I'm in the shop!
As far as your finish, I'd say go with the Ceracoat, it's probably the closer of the original finish, but get it done in flat or satin, a black Ka-Bar should NOT shine! Semper Fi, Rex
BTW,There was also someone on here that was providing a service to do custom coating on knife blades a while back, I looked at his stuff and it is awesome, I think he even gives a guarantee, but don't quote me on that, maybe someone can remember who he was.