Absolutely love both of these! The AD is one of my all time favorite EDCs!
There's a few things on that bottom AD that make me think it was after market / 3rd party mods. The only convex edge from Busse I've seen that is that high up and pronounced was on the 2008 SE Sarsquatch. The 2nd thing that seems to differ from Busse norms, is the curvature of the micarta around the talon and lanyard holes. Much more relaxed on your AD that the typical Busse that conforms to the radius of the talon & lanyard holes. And lastly, that curve at the top of the ricasso where the blade grind meets the flat, is not seen on your typical Busse of that era. Early blades in A2 steel had similar... but nothing I recall in models in that era.
I agree with Jaxx that it was probably a milganzaaa AD originally... and that's definitely black micarta.
Ban was doing regrinds around that time... with convex edges that looked exactly like that. Maybe it was one of his regrinds.
An absolute beauty, none the less!