The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
I'm pretty sure he's talking about the double detent method of opening and closing.
The Spyderco dog tag knife has the same system.
I have nothing to add except that I just looked up that Sharpy and want one real bad. What a beautiful knife that I have no use for at all, but I can't help but want one.