While there are some similar design cues (and one can say the same for all dive watches with a rotating bezel), there are enough differences I wouldn’t say the Bulova was a copy. First of all, while the Airman is a GMT of a sort, this is only because it has a 24-hour time function and a 24-hour rotating bezel.
The Bulova on the other hand uses a 12-hour time function with a separate 24-hour hand. It’s as much a copy of the Rolex GMT Master as the Airman.
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