My EDC knives are a Case 62087 (red bone scales and it was made between 1960 nd 1964.) It is identical to the first knife my Dad ever gave me. about 45 years ago. The other is a Case Mako that I carry in a belt sheath. It was made in 1981 and has a 'thumb stud' I added a few years back, for one handed opening.
I have carried a knife every day of my life, since around 1962. The ONLY exceptions have been when I have been hospitalized, or I had to go into a Court House, or other Government type building. And that has only been since 9/11.