Posted 2 years ago
This is a Phinney-Walker Rim Wind, Slide Set car clock.
Move the case slide (located at 10:00) downward and turn the dial rim clockwise to wind the clock. Move the case slide upward and turn the dial rim to set the clock.
I imagine there was some type of bracket to attach it to the steering wheel, dash, or could be in-dash mounted.
I found this information on-line:
One of the most famous and highly regarded manufacturers of vintage car clocks was the Phinney-Walker Company in the USA. This company was established in New York in 1903. In the veteran and vintage era, this company designed and manufactured mechanical automobile clocks. These clocks were exported around the world and were fitted into a wide variety of makes and models including the prestige makes such as Rolls Royce and the more common automobiles produced by Ford and General Motors.
Thanks for looking,