Speaking of old rigs, I still have my dad's John Deere 6' cover crop disc with matching tooth harrows he built. My little Kubota 3130 has about the same drawbar horsepower his old Allis Chalmers WC had, and a drawbar implement works just fine.
I have also held on to my grandfather's 1 kg. Solingen cleaver. When I was a toddler, I remember him putting a sheet of plywood on the old oak kitchen table and butchering a cow in the kitchen. 2.2 lbs of steel goes through bones like butter.
I still have a powder horn my ancestors used on the Oregon Trail in 1846 that I use once in a while for Cowboy Action Shooting. Sadly, the flintlock they carried has long since crumbled to rust, the victim of lackadaisical black powder cleaning. I also have my grandfather's Winchester 97, manufactured in 1898. It's a pre-breakdown model, and probably rare as hen's teeth. I duck hunted with it as a teenager, but it hasn't been fired in decades, since steel shot came in. I keep it oiled.
I was an avid photographer once, and have several hundred slides, so I keep an old Carousel slide projector. I should scan them now that storage space is so cheap. I took photos all over the world, and slides were way cheaper than prints.
Hmm. Other old stuff...A banjo shredder for kraut, plus a 3 gallon and a 4 gallon crock that are both older than I am. I have two pitchforks that I used for putting up loose hay when I was a kid in the '50s. They still get used occasionally. I also have two sets of hay hooks, but haven't raised livestock in years. I have a 5' one man buck saw hanging on the woodshed wall as decoration, but don't use that either. I even have a couple pounds of lead arsenate insecticide, that I only keep because I'm pretty sure it would be about impossible to buy nowadays. It will kill just about anything, and make sure everything in the area stays dead for years. No, I haven't used it.
Farms collect things. There's always a corner in the barn for that old walk-behind sickle bar mower.