A link to a Breguet page which includes two movements with the "Kidney piece" which is an EOT graph realized on a circle. It turns once a year.
http://www.breguet.com/en/history/inventions/equation-time Some more equation watches: http://iwmagazine.com/news-and-now/20160225/five-equation-of-time-watches/ A page listing the EOT as among the Top Five Useless Watch Complications http://www.ablogtowatch.com/top-five-useless-watch-complications/ Bob
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