Scanned and provided to the general public by the lovely Marya Koshkina here and here. There were no official celebrations of Christmas in the USSR, of course. All of that energy was shifted to celebrating the New Year.
This has to be one of my favourites:
Because I was born in 1984, I was able to experience something of what this card portrays. And by that I mean that I got to watch other people drink Soviet Champagne.