Thanks for those photos Jay. Some thoughts..
1- That "SOG SPECIALITIES" logo model, do you have the box for it or know the designation?
The S1 version was sold as the SOG-1-F so I'm wondering if that Trident has some similar designation preceding S2.
2- The Trident 2.0s both far right in your photos as well as the guardless one have clearly different grind lines at
the ricasso from the Hattori made ones which also always used the protruding airplane nut on the pommel. Very interesting to see
the side-by-side difference.
3-That guardless Trident 2.0 clearly is designed to bypass the Russian law which requires utility knives with blades longer than 95mm to have no guard. Pretty weird looking I think but very unique.
Ken