Theres also a rotary-type, slide rule function to convert units and calculate fast the essential flight data. But then again, computing speed or fuel consumption is not meant only for aviation. Features: Stainless Steel Case Stainless Steel Bracelet Quartz Movement Calibre 7T92 Scratch Resistant Hardlex Crystal Black Dial Chronograph Function Tachymeter Flight Slide Ruler Luminous Hands And Markers Three-Fold Clasp With Push Button Screw Case Back 100M Water Resistance Approximate Case Diameter 44mm Approximate Case Thickness 10mm.The item "Seiko SND253P1 Flightmaster Pilot Slide Rule Chronograph Men's Brand New Watch" is in sale since Thursday, October 10, 2019. This item is in the category "Jewellery & Watches\Watches, Parts & Accessories\Wristwatches". The seller is "eluxzuk" and is located in Preston. This item can be shipped worldwide.