Can't believe no one has stated this.
If you are unsure as to its legality, the last thing you want to do is conceal it. Open carry laws down here (in Oregon) mean it is cool as long as you aren't hiding it and it is legal for you to possess in the first place. As soon as you conceal it you are carrying a concealed weapon, which is most definitely illegal without the proper paperwork.
Keep in mind nearly every building in existence receiving federal dollars (schools, courts, the post office etc) have a straight up ban on all weapons.
Lastly, if it has sentimental value, just rock it when you are at home man. You don't need it to end up in evidence lockup. Just pick up a cheapo 440c folding blade for being out and about. 3 sharp inches will do anything a Buck 110 would do when you are in public and can be deep set in your pocket.
And, somewhat related, snapping a pocket knife open with confidence can have the same affect as pumping a 12 gauge. It is like a smile, the same in all languages, except its a grimace that says you are willing to defend you and yours. And the best way to defend yourself with a knife is not to stab someone, but rather to dissuade them from coming at you any further.
Good luck and be smart bro.