I have a few prototypes myself, but mostly Leatherman. It's nice to see some rare SOG prototypes have made it into the wild too!
The only Power cut that I know of that actually made it out into the world was the one that was made by a member here. As I recall, SOG was trying to use a stainless steel in the head and had fracturing issues since it wasn't hard enough. Our member ( a different Bob!) made one using a commercially available cutter out of a carbon steel. SOG likely didn't want to use a carbon steel because of rust and warranty issues.
Beautiful collectable you have there, and I hope we get to see some more! SOG doesn't get as much love as they deserve here, that's for sure!
Def