Rolex Milgauss$6,200; ROLEX.COM
Steel, resistant to magnetic flux density of 1,000 gauss, 40 mm. The Milgauss, if you can find one, sells for $2,000 above retail.
Also try: steel Rolex Daytona ($9,200); Panerai's Black Seal Ceramic ($6,500, with a waiting list).
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