Before he discovered the perfect golf disc design, Jan Sobel made freestyle discs called "Floaters" and 3.5" diameter minis with a single crown. The first picture shows a few of Jan's Floater mini calling cards. At some point, he went to a similar looking 4" mini. The second picture shows the 2 different sizes with the same wave sticker.
Jan had a succession of company names, Dream Flights, Destiny Discs, Dynamic Discs, but it appears that after the early 80s he was concentrating on golf discs.