3508, Ingenieur 500000 A/m, Steel
A ref. 3508 IWC Ingenieur 500000 A/m, a very technically accomplished Ingenieur made from 1989-1992 that was the first wristwatch to top 500K A/m resistance. Its 34mm steel case incorporates a soft iron Faraday cage and beryllium/nobium hairspring, the first of its kind. For comparison, the famous Rolex Milgauss is so named for its 1,000 Gauss resistance, which is only about 80K A/m. It proved so expensive to develop that IWC lost money on each one sold. Total production of the 3508 lasted just under four years, during which it is estimated that around 1500 examples were made, of which fewer than 614 will be this steel only. This example includes its original box.