Mechanical stopwatch by Lemania – chromed case – Nato stock number – original packaging Precista stopwatch used in the precise timing of sonar beep echoes in the detection of enemy submarines!History - "These stopwatches were designed circa 1940, for specific purpose: they were calibrated to measure a distance of up to 5,000 yards over a maximum six seconds interval.These stopwatches wew used in conjunction with the Asdis sonar apparatus aboard anti-submarine warships.Sound passes through seawater at approximately 1,650 yards per second (four times faster than through air).The asdic operator started the timer on the emission of the sonar "bleep", the sound wave being reflected back from the target object, so travelling over twice the distance in twice the time necessary to compute the...

Rare Stopwatch 1/5 Sec Precista Beautiful & Anchor Shaped New The description of this item has been automatically translated. If you have any questions, please feel free to contact us. Condition 1 (very good)-Beautiful chronograph PRECISTA, in perfect condition(it's still ...)52 mm diameter and with fully functional movement. , the dial is beautiful, the second hand makes one revolution every 60 seconds, accuracy of 1/5 second, the glass has no scratches, pressure pad, the movement marked GBF 411 is spotless. The price for this chrono is less than 300 Euro! I guarantee the highest reliability and truthfulness of the object. For more info or photos contact me. ... ... And don't EXPECT ME to BE BACK at AUCTION because the CONDITIONS are the SAME ... AAAND ... ... ....  SOMETIMES I TAKE...