1970’s British Military Asymmetrical Chronographs

DEF-STAN 66-4 (Part 2) included a small but significant change from its first issue in April 1969 to its second issue in April 1970. http://www.reptripleawatch.co The latter changed the standard to allow for pilot’s chronograph cases to feature either one or two “pushpieces,” or buttons, to control the watch’s chronograph function. That change allowed for manufactures to use the Valjoux 7733 movement we’ll discuss below.

The dials are black, with white markers, illuminated 12 and 6 numerals, and illuminated dots at each our marker. The current time is displayed by central hour and minute hands and a running seconds hand in the 9:00 subdial. The chronograph time is counted by the center seconds hand and a 30-minute counter in the 3:00 subdial. The chronograph is activated and stopped by the top pusher, then reset by the bottom pusher.

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