This is a vintage Cannon P3-CG-11 to Cannon XLR-3-11C Cable measures 24" end to end. 
 
Cannon connector cables trace their origins to early 20th-century electrical connector designs by ITT Cannon, and later became a standard in professional audio through the development of the now-familiar XLR connector. By the mid-1900s, these connectors were widely adopted in broadcasting, film, and recording for their durability and secure locking design.
 
Sought after today for their classic build quality and period-correct look in timeless studio setups, vintage Cannon connector cables are still used today for microphones, mixers, and outboard gear, offering the same balanced, noise-resistant signal as modern cables.