This is a parallel mount dial pointer (part #112619-1). It features a 1 1/4" x 3/4" rectangular mounting base designed to attach to a slider track or drive cable, extending a 1 7/8-inch indicator needle parallel along slide-rule glass dial scales. This style was commonly used in tabletop radios and console receivers manufactured by companies like Philco, Zenith, RCA Victor, General Electric, and Crosley.