Big congrats on you papaws 86th birthday.
Benny, I'd go easy on pushing another knife on him. He's walked this earth for 86 years, and has developed some very definate ideas of what works for him. Like the clothes hanging in his closet with the tags still on them; they probably are not what he has worn for the past couple of decades. I knew one old timer that would only wear Big Smith overalls. Don't even try to get him to wear Oshcosh or Carhart. Something, maybe the pocket layout or fit, made him not want any other brand.
Kind of like knives. It looks like the main blade of that little imperial has seen a lot of use. Maybe the Imperial brand has some meaning to him that you don't know about. Or that particular knife means something, and he won't replace it till he absolutly has to. Or maybe even it's a soft opening knife without great walk and talk that he can open easy. Of late I've become very aware of that issue.
Old timers have some very distinct notions.
Maybe look over E-bay and find another Imperial like that one. Better still, talk to him about it, and ask him what he wants, and give him a choice.
Maybe he does not want anymore material possesions. I know for the last several years, I've told family NOT to buy me anything for bithdays or Christmas's exept for consumables, like Even Williams whiskey, pipe tobacco, or ammo. Material things mean less the older we get.
Talk to him about the issue, and ask him if he had a choice, what does HE think are important qualities in a knife to carry. :thumbup: