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So how hard would it be? I was reading a description of how the Bernhardt Instruments Globemaster modifies an ETA 2836-2. Why couldn't this be done on a 6309? Or am I showing a complete level of ignorance on how the 6309 controls day/date which perhaps differs completely from the ETA?
"The modification is really quite clever - in its native, unmodified form, the 2836-2 adds day of the week display capabilities to the 2824-2 - basically just a gear train which rotates a wheel a complete revolution once every 7 days. By modifying the gear ration of this gear train, it makes a complete rotation once every 24 hours. Replace the standard under-the-dial day of the week display wheel on the standard 2836-2 with an on-top-of-the-dial orange skeletonized 24 hour hand, and viola! You have yourself a watch with a 4th hand which can be independently set, and rotates around the dial once every 24 hours - giving the Globemaster very unique GMT functionality."
"The modification is really quite clever - in its native, unmodified form, the 2836-2 adds day of the week display capabilities to the 2824-2 - basically just a gear train which rotates a wheel a complete revolution once every 7 days. By modifying the gear ration of this gear train, it makes a complete rotation once every 24 hours. Replace the standard under-the-dial day of the week display wheel on the standard 2836-2 with an on-top-of-the-dial orange skeletonized 24 hour hand, and viola! You have yourself a watch with a 4th hand which can be independently set, and rotates around the dial once every 24 hours - giving the Globemaster very unique GMT functionality."