Information and picture from the Wikipedia entry for The Beatles' Christmas Album
"Each year from 1963 to 1969, The Beatles had recorded a short Christmas message for their fans, comprised of carols, skits, jokes, and thanks to the loyal "Beatle People". Each recording was pressed onto a 17.5 inch flexi disc and mailed free to the British members of the Fan Club.".
Several off-key, a capella versions of "Yesterday" are dispersed throughout the record, alongside Lennon's "Happy Christmas to Ya List'nas," "Auld Lang Syne," a possible copyright infringement of the Four Tops' "It's the Same Old Song," and an original poem titled "Christmas Comes But Once a Year."
Many members of the Beatles' US fan club did not receive this (or any) Christmas flexi-disc in 1965. Rather, they received a black and white postcard, with a photo of the fab four and the message, "Season's Greetings -- Paul, Ringo, George, John."