Inside the James Arthur Patek Philippe Grand Complication by Roland Murphy

2023 Ward Francillon Time Symposium
Roland shares his experience and the images he took in the mid-1990s while he serviced and repaired James Arthur’s Patek Philippe Grand Complication.
Roland Murphy is a watchmaker and the founder of RGM Watch Co. He attended Bowman Technical School and W.O.S.T.E.P in Neuchatel Switzerland.

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Presentation slideshows are available for download here
tinyurl.com/yfjvv7d2

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What is the difference between the arrangement of wheels in the mechanism of clock or watch with sub second hand and clock or watch with centre second (thin and long second hand pivoted co-auxial with hour and minute hand)?