Here is a photo showing my wife's 1964 21-window Deluxe Samba Bus, alongside my 1967 Deluxe Bus. The "deluxe" referred to the silver trim around the body...NOT the little windows along the top. She's also got the full-length sunroof on hers.

My red one is still cool...but NOTHING like the rarity and cool-factor of the 21-window version.