I still have my very first shotgun that I bought with my paper route money way back in 1958, it was an Iver Johnson 20ga. single shot Champion. Since that time I've completely restored it, and enhanced the color case hardened frame by having it brushed chrome finish, and re-blue the barrel and refinish the stock. Again it is worth more than I could ever imagine, but just to me.
I have a Remington 512, same gun, but tube fed. My wifes' father bought it for her the year she was born, 1955. She gave it to me. Its in excellent condition, and has a grooved receiver. I understand most didn't have the grooves.
I have my first gun, a stainless Ruger Mark II Target, I bought it new in 1988, and will never part with it.