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tonneau
A watch with a barrel shaped case that has two convex sides
tourbillion
A complication in mechanical watches that eliminates any error in timekeeping that might be cause by shifts in location due to variations in gravity ...
Wrist watch dials come in all sorts of shapes and the following terms are used to describe them: round, oval, square, square cut corner, cushion, rectangle, rectangle cut corner, tonneau (oblong with outwardly curving sides), ...
 See also: Movement, Hands, Dial, Case, Seed pearls
  
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