So... It's Granny Smith Apple...:
"...to indicate that Let It Be was not distributed by Capitol Records, the original record label in America sported a red apple, rather than the Beatles' usual green granny smith apple."
http://en.wikipedia.org/wiki/Let_It_Be_(album)

Granny Smith:
http://en.wikipedia.org/wiki/Granny_smith

Apple
http://en.wikipedia.org/wiki/Apple_Records