I like sexy knives, with symmetry, but that is not an absolute. Well made, good solid hardware....adjustable pivots, not chain rings, hidden pivots are cool too, as long as they can be adjusted. Bayonet grinds are sweet, as are true double tanto grinds, in the American style. Here are some visuals completely conforming to the "Les Robertson Tactical" definition, these knives have either been mine or are mine.

This knife was slab sided when I got it for a sweet price, and Kit put bolsters on it for me.
YES!
To me, nothing says Old School Tacticals like a nice Carson.
You got a great example of what Les himself called a "gray turd".

I remember running into Les' ads all the time back then in the knife mags.
He special ordered / organized a great run of a bunch of custom tacticals by the some of the top makers at that time for his store, LDC line?(dont remember the name).
I was lucky enough to work at a boutique gun store in L.A. in the mid to late 90's at the "tactical boom",
and owned a bunch of great stuff, like Carsons and Terzuolas.
I got back into collecting about 3 years ago and it was just a matter of time before I tried to "buy back" that time in my life.
Well, I got a 90's vintage Carson again, this time BETTER, with no serrations.
Also grabbed a later Terzuola ATCF. Not the same era or style as my first one with beadblasted bolsters, this is a newer style Framelock/bolsterlock?
Still has that great Terzuola F&F, and makes the same sound when opened as my first one!
Notice the cool original Crawford Leopard in there too. Its pretty scratched up.
I'm gonna send it in to the man himself like I did for a beat up toplock that needed a resto.
I'm thinking of getting a clip added and the blade polished on the leopard and carry it, since I baby the other two mentioned.
I may have posted these before, but I cant help showing them off.
Again Steven, great collection and examples.
And YES, Les does know more than 99.9% of us.