Dayton Friction Toy Works founded in Ohio, 1909-1935. SON-NY. Founder was David P. Clark.
D.P. Clark was the predecessor of the Dayton Friction Toy Works. Specialized in pressed steel friction toys with patented horizontal flywheel (1926) under trade name "Gyro".
Dayton toys utilize a slightly smaller flywheel that connects to only the rear wheel through a more complicated rear mount with pressure wheels. These cars are completely made of metal. The friction mechanisms have not held up as well as the Clark mechanisms and are more prone to problems such as binding and drive mechanism slip.
See also Schieble toys.
What's it worth? Take a look at this Dayton price guide: sold listings for a value indication.