Great question, and I am afraid that it is one that has a very small chance of being answered any time soon.
But, basically
3" blade with the tip at or below the center line of the handle
no sharpening choil, would want the edge up close to the handle
Thin stock with thinness behind the edge
good steel, stainless preferably
no compression lock
no slots or holes in the blade
not a front flipper
thumbstud or back flipper ok
handle scales with some texture, not all metal/slippery
Something along those lines

G2