This is an upward-pointing T-bar slide-rule dial pointer (part #122351-1). It features a 1-inch horizontal mounting base with a 1/4-inch width designed to attach to a slider track or tuning cord, extending a short 7/8-inch vertical indicator needle upward. This style was designed for compact slide-rule dial scales and glass assemblies found in tabletop radios and consoles manufactured by companies like Philco, Zenith, RCA Victor, General Electric, and Crosley.