Milgauss GV "Green Crystal" (116400GV, 2007-2023)

The 116400GV is a 40-millimeter steel Rolex designed to keep a mechanical movement working around magnetic fields. It belongs to the Milgauss revival of 2007, which brought back a model first introduced in 1956. The original purpose was practical: equipment in scientific and industrial workplaces could disturb a conventional watch's rate.

Inside this version, a shield surrounds calibre 3131. Rolex designed the watch to resist magnetic fields of 1,000 gauss. The movement also uses components selected for their resistance to magnetism. None of that protection requires the green glass or the orange lightning-bolt hand.

Those are the choices that make the GV look so different. Green-tinted sapphire forms a colored edge around the dial. The orange seconds hand bends into a lightning bolt, a shape used on the early Milgauss and restored for this generation. The three-link bracelet has polished center links, and the smooth bezel leaves the colored face without a competing numbered scale.

The original GV had a black dial. In 2014, Rolex added the Z-blue version, placing a bright blue face beneath the same green crystal. The black version concentrates the color at the edge and in the hand; the blue one spreads it across the dial.

There is no date window. The uninterrupted face gives the straight hour markers and crooked seconds hand room to remain distinct. The hand is a fairly literal illustration of electricity on a watch intended to resist magnetism—more playful than the hidden technical work would lead you to expect.

For this reference, the glass is part of the identity. A blue or black dial alone does not describe it: the green sapphire sits between the dial and everyone who looks at the watch.