A flat piece of metal, typically disk-shaped, that serves as a foundation for the movement and/or for one or more complications. The “main” or “bottom” plate bears the bridges, cocks and other parts of a movement. The motion work is generally found on its underside. The bridges and cocks are affixed to its upper surface. The plate has threaded holes to accommodate screws as well as smooth holes for the jewels that bear the wheel train’s pivots.


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