For a different brand but is this any help (link):
...Composed of five basic models available in more than 60 versions, Navitec’s Tango Charlie watches are delivered with five interchangeable and graduated bezels (60-minute chronograph; VS 80-90; VS 100-110; VS 120-130 and VS 140-150 that permit estimated flight times or estimated times of arrival for different types of aircraft flying between 80 and 150 knots, or even on ultra light aircraft flying between 80 and 150 kilometres per hour)...
...?
PS I see that your pictures have different bezels...one had VS 110 in red and the other has VS 130.
PPS Wiki tells me that VS is the an aircraft's stall speed or minimum steady flight speed at which it is still controllable. Perhaps that is relevant?