Large 40mm polished steel case with three-piece flat-link brushed steel Oyster bracelet. The Rolex Milgauss was originally developed as a tool for scientists working in extreme magnetic fields. Having evolved over nearly 70 years from the original ref. 6543 plexiglas model, into the current distinctive form with green sapphire crystal and lightning-bolt seconds hand. Robust self-winding anti-magnetic Rolex calibre 3131; the watch is water-resistant to 100m, and is offered in excellent un-marked condition with its original Rolex box, manual, Milgauss booklet, swing tags and UK-origin international warranty card. 2-year Watch Club warranty.