Auctionata 13zn Enamel

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hi,
another idea, because of the 0-300 scale = 1/5second-scale appears normally only on older english navigation chronographs or Doctors-watches: perhaps it might be useful to check out,if the two enamel-13zns were delivered to GB. The only longines-chrono i saw until now is pictured in John Goldbergers "Longines Watches"; it´s a clock/navigation-chrono, probably used in early airplanes or zeppelins.

rgds - h.u.
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Thanks h.u.

Others have also suggested that this could be a pilot/doctor watch, because of the 0-300 scale. When I get a chance, I will see what I can find out.