I got various items from the 70s, cookwear etc. But that's not so impressive. My pride and joy (besides cast iron) is my Desk.
When my parent bought their first house in the 1970s there was a desk on the curb. The previous owners didn't know how to maneuver it out of the house, the they CUT IT IN HALF instead! My parents being young and poor, put it back together with new trim and a Formica top. My Dad used it for decades before upgrading, and now I've had it for decades too. No providence on its owners before us, but based on the style I would say its from the 1930's or 40's.
If there are two things that are going to make this list for people it's going to be furniture and cast iron cookware. My mom always told me to buy Ethan Allen, because, while it's more expensive, there stuff last for generations. The one chair I bought from a store, didn't come from there, but was a floor model, tube steel, wood clad chair. My grandkids will love it one day.