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Very the complicated
The blue white window is for the 3rd hand which is hidden by the larger hour hand. The 3rd hand, which is blue and pierced, is used to indicate home time. The upper hour hand can be used to set the local time in hourly increments. Since the display is a 12 hour display, the blue white window is used to display night or day. The date will follow the upper hour hand and can be adjusted forward or backwards dependent on the direction of travel. The GMT function, as I understand it is only on the automatic version of the watch, while the manual wind has the date display. It is also interesting that the chronograph uses the column wheel and vertical clutch system, something you don't see very often now.Oh and as for the time, I would think that the home time is 9:46 pm while the local time could be 2:46 am or pm (based on the photograph below).
