From the Saved from the Paper Drive blog, here's a collection of fascinating 1950s-era Russian holiday cards with a space theme. This is from the Sputnik era and the beginning of the space race.
"Christmas wasn't publicly celebrated in Soviet times [hence the title quotes in "Christmas"], only in church on January 6th.
"The greetings on these cards is not 'Merry Christmas' but, more or less, 'Happy New Year.' The tree depicted on some is a 'New Year's Tree.'"