The Rolex Milgauss, first introduced in 1956 with the ref. 6541, is renowned for its precision in high magnetic fields, catering to scientists requiring a resilient timepiece. Unique to the 116400GV version is its green sapphire crystal, known as "glace verte," providing a distinctive green halo around the dial's edge, setting it apart from the discontinued non-GV version with clear sapphire. The now discontinued Milgauss stands out for its functionality and distinctive design, making it unmistakably recognizable by its signature orange lightning bolt seconds hand.