The Langendorf 6630 is an open face calibre watch movement featuring a stop function with a pillar wheel. It is commonly believed to have been manufactured by Valjoux but is frequently listed in catalogs solely as Langendorf 6630. The movement offers several functions, including a timer with 60s (0.2s) and 30min capabilities, controlled by the pillar wheel. Additionally, there is an optional setting for 30s (0.1s) and 15min intervals. The Langendorf 6630 movement is designed for stem winding and features a sweep second hand.