But boy the 7121 shines as an openworked movement. The bottom plate link the dial side in watchmaker's parlance the back of a movement is the top and the dial side is the bottom since that's how a movement sits when you work on it especially has been link really beautifully opened up organized in a series link of semicircles loops curves and full circles that provide a wonderful frame for the active components in the movement the view is almost totally unobstructed.