The first pilot watch built by Hanhart in 1938 was the one-button chronograph “Calibre 40” with black dial, luminous numerals and the small distance between hands and dial in order to guarantee quick and unimpaired reading of time in bright lighting as well as in the dark. Followed by the legendary models “Tachy Tele” and “Calibre 41” in 1939, these watches came with a rotating bezel, luminescent hands and numerals, and red painted button with asymmetric position of the buttons for supreme ease of operation. The variant with only one chronograph button allows only one timer action and the reset. In the two button models, e.g. Tachy Tele and Calibre 41, the top button started the time measurement, which could be stopped and restarted again from this point. The bottom button instantly reset the indicator to zero during measurement (fly back function).http://www.fratellowatches.com/pilots-watches-from-hanhart/

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