Rolex Milgauss Oystersteel — Black Dial, Domed Bezel | Ref. 116400

Introduced in 1956 for scientists and engineers working in high electromagnetic-field environments, the Milgauss has always carried a utilitarian rationale that sets it apart from the rest of the Rolex sports catalogue. Reference 116400 — the first modern Milgauss when it debuted in 2007 — restored the model after a decades-long absence with a clean black dial, Oystersteel Oyster case, and the distinctive lightning-bolt seconds hand that is the model's most recognisable signature detail.

Calibre 3131 powers the 116400, a dedicated variant of the 3130 base calibre fitted with a soft-iron inner cage that shields the movement from magnetic fields up to 1,000 gauss — a specification that was extraordinary at its introduction and remains relevant in scientific, medical, and industrial contexts. The 40 mm Oystersteel case carries the domed stainless steel bezel that emphasises the Milgauss's utilitarian lineage, and the heavy-style Oyster bracelet with Oysterlock clasp provides secure, robust wearing comfort. Water resistance is rated to 100 metres.

Among Rolex collectors, the 116400 in black is valued for its relative restraint — the lightning-bolt seconds hand is the only overt flourish on an otherwise purposeful tool watch. Pre-owned examples with original box and papers represent a compelling proposition: the Milgauss occupies a niche within Rolex production that limits supply, and the model's historical narrative — from CERN's particle accelerators to its recent scarcity — continues to attract a dedicated following.