"And the last 7 jewels, they are sitting in the rotor bearing. Which, as it turns out, was better for advertising than longevity – as impact damage can cause the ruby rotor bearings to fracture. Many of the 44 jeweled versions now live with 37 jewels, with the ruby bearing unit replaced with a steel ball bearing unit from the lesser models of the family. The ruby bearing units are no longer available and were swapped out in service during the 1970s." - Kris Bubendirfer
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