![Auto Beat Escape Wheel FHS 131/261 23 cm (10751616207)](http://perrinwatchparts.com/cdn/shop/products/CP.0154-600_600x600.jpg?v=1595352170)
Auto Beat Escape Wheel FHS 131/261 23 cm is an escape wheel specifically for Hermle 131 & 261 Auto Beat Movements with a pendulum length of 23 cm. Pendulum length is indicated on the plate of the clock, it is not the actual measurement of the pendulum.