PWork
Do you have the teardrop shape "handle" and the tapered shaft on that old PROTO of yours? Found one in my dad's shop 25 years ago, stayed on my keyrings until about 4 years ago when my wife took it from me for herself. erg. The Swisstech Screwzall will do things it will not do, but I still miss it for many things. Looked into geting another 3 years ago and it was not marketed then.
The new one looks like you can get more torque from the wider head, but the keyring gave a wider torque arm than the handle anyways. The old one just works so smoothly. No sharp corners except for the slot blade. No semi-phillips either, but those are usualy more trouble than they are worth. I do not know what steel they used but it has taken a real beating from some pry jobs. From the 3 dimensional shape it must have been forged, not stamped from a sheet. It even worked really well to lift an occassional chip, if you had the static under control otherwise. My wife wants a phillips just like the old one, not a combo blade.