If you're lucky, it will have a printed datecode and quantity. Some places did that. it will be a number like
XXXXXXX x/41 10M
The xs are what I think is the job number, x/41 would be the date printed, and 10M would mean 10,000 copies.
Not everything had a code, and they don't always have all of that, and sometimes part is at the lower left of the page and the rest at the lower right.
If it was a union printer, there should be a union logo and number which indicates the printing company.
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