Minis are far more narrow and 1/2 "scale" of the #13-12". Standard 6" Model #13's are thicker, wider and have a full sized handle. They were made without the cutouts 40 or so years ago (as well as in a little more modern times I am sure). Just one more difficult thing to hammer down a specific time period. I cannot load Mitchell's example. He'll be around.
Best, Capt. Chris