First off, Very sorry for your loss. Your Dad's collection is quite impressive. I'm sure it's a bit of work photographing and listing them.
No offense meant and no harm intended. But, my question to you is this: Have you actually sold any of these knives yet? Current offerings from some of the best knifemakers in the country don't push these price points. So, personally, I wouldn't have an interest. But, that's just my opinion. Others may feel differently.
If I were you and your brother, I may not be able to sell them at all, given they once belonged to my father. Everything I have of my Dad's, I couldn't sell right now. Even the guns I bought him. Maybe that will change in the future. I don't know.
So, I guess my point is this: Do you really want to sell the knives or do you really want to keep them? That is the real decision. Obviously, they are very valuable to you.
Note: High end perfect items typically don't sell well here on the fire. (See pre64 Winchester Model 70's). There may be a better market elsewhere.
Hope this helps get you to wherever you want to go.
