(Photo credit: Jake’s Rolex World)
Many online have tried to imagine what a new Milgauss would look like, as Watches and Wonders approaches and speculation builds around its 70th anniversary. Introduced in 1956, the Milgauss was made for scientists working in power plants, hospitals and research labs. Its name combined the French word for thousand with the unit of a magnetic field.
But since 2005, when the blue Parachrom hairspring was introduced, Rolex’s movements have been largely insensitive to magnetism beyond 1,000 gauss, putting a question mark on the model’s raison d’être. The line was discontinued just three years ago.
Rolex does not disclose its watches’ anti-magnetic properties. But for the first time, a clue may be found during the Land-Dweller’s development, when Rolex engineers compared its anti-magnetic properties with the rest of the collection. The Land-Dweller’s balance wheel is made from a lead-free copper-zinc alloy with silicon. Switching to this material raises resistance to about 40,000 gauss, up from roughly 25,000 gauss with the typical balance wheel used in current models, made of copper, beryllium and iron. All that according to Rolex engineers who conducted the testing, marking the first time modern Rolex watches’ anti-magnetic properties have been revealed. The findings were published in a patent filed four years ago.
At Watches and Wonders, Rolex is unlikely to treat the 70th anniversary as a reason to reintroduce the Milgauss. Still, the Land-Dweller gave us a glimpse into the resistance of Rolex watches today, which the brand does not publicize, though it is about 10,000 gauss higher than Omega’s.
Excerpt from a 2022 Rolex patent in French revealing the anti-magnetic properties of modern Rolex movements.