Ronda 9011

pin-lever escapement stem mechanism without setting-lever spring strange: train and hand gear separately driven by the barrel A (Fig.3) The train is driven by the excentric minute wheel B. The hand gear is driven by the the minute pinion D, running on post C, and the friction coupled cannon pinion E on it. This design was chosen here to achieve a low profile, but it requires high precision, because so many wheels are involved in the coupling between second- and minute hand. Provisions for shake-free transmission, as common in expensive movements of this kind, are not applied here, and therefore the minute hand has a certain play when set.