Rolex 1940s Antimagnetic Chronograph 37mm Stainless Steel Manual Wind Watch Ref. 2508 W/Leather Strap - This rare vintage timepiece from Rolex is the Antimagnetic Chronograph, reference number 2508. This watch was one of the first chronographs by Rolex, and features a silver chronographic dial with two subsidiary counters, tachymetre and telemetre scale, and painted Arabic numeral hour markers. The watch has a 37mm stainless steel case with second generation rectangle pushers, and is powered by a manually-wound 17 jewel movement. The case back is numbered "2508 703816 BREVETE". The watch is fitted with a red leather strap with Rolex buckle. Measurements: 6.5" buckle to first hole, 8.5" buckle to furthest hole. Condition: The watch is working and is in excellent vintage condition. The strap does not appear to be original to the piece.