New 8 Day Clock Mechanism. This is a new 8 day hour and half hour strike movement mechanism. The drop back mounted pendulum and gong hand shaft enable this movement to fit into a variety of cases. The length from the top of the frame to the bottom of the pendulum hammer measures approximately 8 3/4" (222.25 mm). Overall it measures approximately 6" x 2 1/2" x 6" (152 x 64 x 152 mm).