It was around a year ago I sold a spare Dakota on this forum. Same super desirable era. True magnum action. Africa model with all the bells in whistles. It was in the more desirable 416 Rigby. It was either unfired or had been fired less than one box of ammo. I think I sold it in the low-$6k range after a month on the site? Its wood was beautiful but not as beautiful as the example shared above, but other than that it was superior in every measurable way.
As a collector I do not own wildcats, nor do I own goofy cartridges that marketing teams designed to cram a proven, storied Africa cartridge into their mass-produced long action. (e.g. anything that ends in Remington or Ruger) As a hunter, I know that if I lose my ammo or I run short in the bush on a month long safari, I can get on whatsapp and beg-borrow for "normal" calibers but not these goofball ones. 375HH, 458, 416 Rigby, 470NE, 404 Jeff, 500 Jeff, 500NE, 450/400 3". That's what exists in the bush and its ironically the calibers that hold their collectible value as well.