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KuhlooKuhlay 7 points ago +7 / -0

No licking the envelope or stamp either

5
Chipper875 5 points ago +5 / -0

Also home printers leave invisible tracking dots on pages you print

5
BeefyBelisarius 5 points ago +5 / -0

Modern ones do. I wonder if there's any working dot matrix ones still out there. Or get a vintage typewriter, I'm sure there's enough hipsters out there that someone must be making ink ribbons.

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Red_Ensign 1 point ago +1 / -0

Apparently the law prescribing ID dots on printers was passed in the early 1970s.

So you would have to go entirely analog and use a printing press or a typewriter.