The VW Samba-Bus, a variant of the VW Microbus. It has skylight windows and cloth sunroof, first generation only, also known as a Deluxe Microbus. It is a Standard microbus with additions that include trim strips along the beltline and a dash clock. They were marketed for touring the Alps, as they had small skylight windows embedded into the vehicle roof to add viewing windows. Samba buses began production in 1951. (wikipedia)
It featured 15 windows and the distinct option of a cloth sun roof. In addition to providing a unique open air feel, the sun roof option added eight sky light windows that resulted in either a 23 or 21-window bus nicknamed the Samba. (rkmotorscharlotte.com)
(Photos from conceptcarzz.com, flickr.com, rezbach.de, sfcitizen.com & maxted-page.com)