The inks probably might have changed over the decades, so it might look different than genuine '70s paper. But on the other hand I'd imagine there are literal tons of green-bar paper sitting in archives from various times and sources if you want to do some archeology
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Of course if you are really interested you can just buy a box of green-bar paper. It's still in mass-production. E.g. Staples carries it https://www.staples.com/Staples-Green-Bar-Computer-Paper-14-...
The inks probably might have changed over the decades, so it might look different than genuine '70s paper. But on the other hand I'd imagine there are literal tons of green-bar paper sitting in archives from various times and sources if you want to do some archeology