Don't remember the Topper, remember the Cushman Eagle and the Lambretta, but Topper is a blank.At that time, AMF owned H-D, and they tried everything wheeled for sales in the '70s, including golf carts and snowmobiles, even a Moped, that was AMF but not H-D branded, but from another company they bought the bones from, Roadmaster.
In the early '60s, H-D made the Topper, but they were expensive and not as good as Vespa and other Italian makes.