While the Milgauss maybe Rolex’s most famous antimagnetic watch, there is another in the current line that uses the same case and movement — the air-king ref. 116900. Today, we examine why magnetism is important for mechanical watches and compare two modern antimagnetic Rolex replica watches.  
What effect does magnetism have on a watch?
Magnetic fields are everywhere around us, and not just because all electronic devices are part of our daily lives; They are also derived from simple magnetic closures on clothing and accessories. Exposure to a strong magnetic field for a long time will change the mechanical movement of the internal balance spring, resulting in serious damage to the watch’s timing ability.
A magnetized watch may run too fast or even stop working altogether. How do you know if your watch is magnetized? Keep a compass near your watch. If the compass needle moves when you move your watch, it will be magnetized.
The good news is that magnetization is temporary, and demagnetization watches are a relatively simple process. However, if you work in a magnetic environment, wearing a watch that is susceptible to magnetization is impractical.
In the 1950s, the scientific research, medicine, and electronics industries flourished. So in 1956 Rolex released the Milgauss, an anti-magnetic watch designed to appeal to scientific professionals who are often exposed to strong magnetic fields. The Replica Rolex Milgauss, tested by CERN, can withstand a magnetic field of up to 1,000 gauss thanks to a protective device made of a ferromagnetic alloy.
Today’s version of the Rolex’s anti-magnetic watch is the Milgauss ref. 116400GV, which debuted in 2007. In fact, about 20 years after the Milgauss 116400 was discontinued, the watch is back in the Rolex lineup.  
Milgauss 116400GV is a great mix of vintage details and modern features. Inside the 40mm stainless steel case is a time-only dial, which includes a unique lightning bolt seconds – reminiscent of those that appeared in the early Milgauss model. The dial colors include classic black or white, and an electric “z-blue” dial with orange details and green sapphire crystal, an unusual color for a Rolex sports watch. In addition to the Milgauss watch, the “GV” in the model refers to the green sapphire crystal on the top of the dial.
Air-king, another Rolex, was discontinued for a while; However, the two-year hiatus was much shorter than the Milgauss. Rolex abruptly removed air-king from its catalog in 2014, only to return in 2016.