https://blossom.primal.net/14ff0f2adece0b42a4c663400674f0b6e2b3b66d331823fe2c89caf66adbcffa.png
imo, "The first free national pager" was pinprick cipher in UK after 1840 )))
"A dot or pinprick concealment cipher is a common classical encryption method in which dot or pinprick is placed above or below certain letters in a piece of writing...
...Victorians used the pinprick trick too, not for spies but to dodge high postage fees (rates varied but often around a shilling per hundred miles or so for a letter before the 1840 Penny Post reforms). Newspapers mailed free, so they’d pinprick messages on the front page and send those instead of letters."
I wrote abt it here: https://aillia.substack.com/p/steganography-101-hiding-wallet-seeds