The Longines 340 watch movement, developed in the period 1965 onwards, features a micro rotor and a double excenter regulator for curb pins and stud carrier. It employs a selfwinding gear mechanism with direction switching facilitated by a pinion floating between two prominent jewels. The movement incorporates indirectly driven minute and second hands, enabling a low profile design. Since 1966/67, there have been minor modifications to the base plate and a simplified date driver. In terms of functionality, the movement is equipped with an automatic winding system, a sweep seconds hand, and a date function that can be set by changing the 23-24h configuration (and since roughly 1966/67 by changing the 22-24h arrangement).