Eight-Day Movement

A specially constructed movement that needs to be wound just once a week. In one eight-day movement, used in the Hebdomas wristwatch, introduced around 1913, the barrel covered the movement’s entire surface. Eight-day shaped movements from the 1930s had normal-size barrels, but each movement had two additional wheels added to its train. Eight-day movements are common in pendulum clocks and other larger timepieces.

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