What Perry said. By the way, I have had an email from a member concerning the "cutouts" on a #13-6". The question was asked "when" the shop started doing this. I have no idea, is my most honest answer. If you look in the current catalog you can see the cutouts. Just for general information I will include some photos of a knife I own. It is real Westinghouse "Ivorite" aka "Old Yeller". It is in it's original Johnson butterfly-stiched roughback sheath (Johnny Johnson) and I would date it about early 80-s to late 80-s..."ish".. Safe to say, for the past 30 years or so...this "cutout" has been the norm on a #13-6"..."NOT" on a "mini". Hope this helps. This is a good topic!
Best, Capt. Chris