These were not really pictures,but rather the "image" was made entirely by
characters on a "real"teletype machine keyboard.In the '60s
there were a number of these would show up at various times.Xmas themes
around the holiday,some pretty good images of Playboy centerfolds also made
the rounds.
These had nothing to do with computers,the person making the image would cut
a tape on his machine.The image could be sent without interuption.This was
real RTTY,no computers.
I would think a few old timers would still have some tapes in their
collection.
Joe
W7KQU