npub1ywyvcvvkchy6g2udk5n79zzc78jm6nl4gqhy2jttkl7pwtszt75qrfcksd (npub1ywy…cksd)
YLEs test image from 1959/: https://yle.fi/aihe/artikkeli/2014/09/23/television-virityskuvia
SVTs test image from 2019: https://www.svtplay.se/testbild
Nowadays I don't see these anymore, as there is more or less programs 24/7.