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At Baselworld 2014, Swiss Oris watches introduced the ProPilot Chronograph GMT as the newest member of its Big Crown ProPilot watch collection, My understanding is that, by 2015, the ProPilot Chronograph GMT 677 7699 was discontinued What happened, according to Oris, is that the movement inside the watch was simply too difficult and expensive to obtain, making it not commercially feasible to keep producing the watch - and it didn't make sense for prices to jump Oris does produce some of its own movements, but the brand's reasonable pricing is still based on its ability to use movements from Swiss companies such as ETA.
Inside the Big Crown ProPilot Chronograph GMT is a modified Swiss ETA Valjoux 7750 automatic chronograph movement that has been upgraded to include a 24 hour GMT hand To this day, I believe this particular watch is the only Big Crown ProPilot model to combine a chronograph and GMT complication, meaning you can get either GMT watches or chronograph watches in the modern aviation-inspired ProPilot collection, but not both Oris did an excellent job of making the ProPilot Chronograph GMT feel very much like a serious instrument/tool watch.
From a strict "Tool watch perspective," it is correct that dial elements should not overlap - such as hour markers over chronograph subdials All things considered, even from a chronograph standpoint, the Oris ProPilot Chronograph GMT is much more legible than most chronograph timepieces out there. . Source