The Ronda 1137 is an open face calibre watch movement that was in use circa 1970. It features a timer function with a precision of 60 seconds and increments of 0.2 seconds, as well as a 30-minute counter controlled by a pillar wheel mechanism. Additionally, it offers an optional setting for a 3-second precision timer with 0.01-second increments and a 3-minute counter. The movement is stem wind operated and incorporates a center second hand and sub-minute hand.