Well, if it's supposed to be 1940's era, then it looks like the real thing. It's definitely been used in the field. 2500.



  • Fact 1: Chronometers, or "sea clocks" were a major technical achievement when first developed in the 18th century.
  • Fact 2: They were the only portable clocks precise enough to determine longitude by means of celestial navigation.
  • Fact 3: The first marine chronometer weighed 75 pounds.
  • Fact 4: It is quite possible that without the chronometer, the British Empire as we know it would not have existed.
  • Fact 5: Christiaan Huygens patented a prototype marine chronometer in 1656, paving the way for modern wristwatches in the process. His chronometer used a balance wheel and spring instead of a pendulum.