I have a half dozen or so of these: https://www.ebay.com/itm/Case-XX-Folding-Pocket-Knife-Model-059L-SS-Lockback-Pennsylvania-Afield-Advert-/254389418661 from back 20+ years ago when I was doing sales and distribution for the (fill in the blank) Afield publications out of Altoona. A couple/three Pennyslvanias, a New York or two and an Ohio and maybe a Michigan or Wisconsin, I forget. They are nice little Case single blade instruments, very sharp and compact. I don't carry one every day though. I'm a bit of a fumble bumble and and need to limit my exposure to sharp implements more than most of you, I'd imagine...🙂 I usually carry one with me when I'm out in my inflatable yak though. Every once in a while, my grapnel anchor gets fatally hung on a submerged log. One dose of sawing through 3/8" poly rope with my nippers was more than enough for me...