Hermle 141-020.21 Rear Pendulum is a FHS Hermle Clock Movement that has a plate size measuring 85 x 98 mm and a hand shaft length that measures 33 mm. This is a 14 day movement with 1/2 hour gong strike, key wound, pendulum- dead beat escape, and 1 hammer at the bottom of the movement. The pendulum length measures 21 cm. Relative to the image, the key hole spacing measures A) 33 mm and B) 57 mm. This particular movement is available in both front pendulum or rear pendulum. This is the rear pendulum version