Explanation of the history and chronology of MILGAUSS products

Cal.3131
Power reserve: 48 hours, water resistance: 100m, case size: 40mm

The current Milgauss was released at the same time as the third-generation Milgauss Ref. 116400. Currently, only the Ref. 116400GV is available. It differs little from the Ref. 116400, including the orange movement and lightning-fast hands. The most obvious difference from the third-generation model is the green sapphire crystal, Rolex's corporate color. GV stands for "Glace Verte" (meaning "green glass"). The Rolex green color is incorporated into the crystal, which is thought to have been a symbol of the anniversary of the Milgauss's revival. While Rolex watches typically feature a watermarked crown at 6 o'clock, the Milgauss's sapphire crystal lacks this feature. In 2014, a new blue dial color, known as the Z-Blue dial, was introduced. The zirconium contained in the blue paint is used to prime and plate the dial, bringing out the blue color of the zirconium and expressing a beautiful blue color.

Cal.3131
Power reserve: 48 hours, water resistance: 100m, case size: 40mm

The third-generation Milgauss was relaunched in 2007, 20 years after the end of production of the second-generation model. One likely explanation for this is the widespread awareness of magnetic fields that arose around the turn of the millennium, along with the rapid popularity of mobile phones. The design combines the lightning-fast second hand of the first-generation model with the simple and stylish smooth bezel of the second-generation model. It maintains the same 1,000 gauss magnetic resistance as the first-generation model. The rotating bezel is now smooth. Another major feature is its new antimagnetic structure. The case incorporates a soft-iron inner case, making it thicker than other models of the same case size. The movement, Cal. 3131, is exclusive to the Milgauss, in addition to the blue Parachrom balance spring. Combined with the use of other technologies and materials, this watch offers even greater magnetic resistance and more stable accuracy.

Cal.1580
Power reserve: 48 hours, water resistance: 50m, case size: 37mm

The second-generation Milgauss. The design was significantly changed from the first generation. The rotating bezel and lightning bolt second hand of the first generation were gone, replaced with a straight second hand. The dial was changed to bar indexes. Compared to other models, the ROLEX logo design is also larger, but overall it is a striking model with a simple design. This model was produced for about 30 years, and underwent several minor changes during its production period, making the hairline-finished dial, which is only found in early models, extremely rare.

Cal.1065M, Cal.1066M, Cal.1080
Power reserve: 48 hours, water resistance: 50m, case size: 37mm

The first Milgauss. The 37mm case, designed to maintain anti-magnetic properties, has a bold presence, a lightning bolt-shaped second hand, and a black dial with dot indices, giving it a dignified look. This model was equipped with a rotating bezel, but it was later changed to a smooth bezel with a polished finish. Minor changes have been made since then, including the addition of an automatic movement. There were only a few first-generation Milgauss watches before they were discontinued in 1987, and the first generation in particular is highly sought after as a collector's item, particularly valuable among vintage Rolex watches.