A 1948 Bradley and Kaye advertisement listed 6 park and 8 portable Little Dipper units were sold.
The manufacturing rights to the Little Dipper were sold to the Allan Herschell Company near the end of 1948.
1953 story on Beverly Park states that 26 Little Dippers were constructed by Bradley & Kaye.
In the 1970s Bradley and Kaye produced and sold new Little Dipper trains using fiberglass bodies. They also refurbished old units and resold them with the new trains.
A Bradley and Kaye ad in the November 29th, 1947 issue of Billboard states they were in the "3rd year of production [of] The Little Dipper Portable Miniature Coaster". So that would suggest the first one was out the door in 1945.