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The Axis isn't a lock back. The OP stated in the title a lock back, one hand opening, etc.You've narrowed the field a lot with the one hand opening requirement. Maybe a BM axis lock may be close? Darn good lock and one hand opening and closing. Many models and steel types to choose from.
There are quite a few makers still with lock backs but not one hand opening. Unless you add one of those clamp on studs you can get. Or a modder could likely add a thumb stud for you easy enough.
Lion steel is coming out with the tm1 as well. It has seipner steel.
The Axis isn't a lock back. The OP stated in the title a lock back, one hand opening, etc.
AG Russell has a couple different models. Pohl Force also has some really nice pieces, while not super glamorous or exotic I am fairly sure they can do the job. Boker has a few nice pieces (German made), Buck, and a couple others can't think of them right now.
That TM1 looks really cool, wow. I had not seen that before, 4D! Woo Hoo!
No need to get upset Joe, it's all good. The only lock back knives I can think of that Benchmade makes is the Bone Collector stuff, but the ones I remember are with a nail nick.