The Harley Davidson scooter, caller the Topper

http://harley-davidson.oldcarandtruckpictures.com/

Here is a Harley Davidson scooter ad, from Popular Mechanics circa 1959
http://www.rukverc.hu/article.php?todo=view&vid=12
This is a better look at the Harley Davidson Topper they are showing and my photos from the Topper on display at the San Diego Auto Museum: http://justacarguy.blogspot.com/2007/01/1960s-harley-scooter-and-trail-bike.html

and they even had 2 varieties of sidecars, found on http://aacalibrary.tumblr.com