The Aurore 1220 watch movement incorporates the Girocap combined settings for the escapement wheel, allowing for optimal performance. It features an indirectly driven minute hand, which accommodates a large balance for enhanced precision. Further details distinguishing the 231 from its counterparts, the 23 and 232, remain unknown. Notable functions include manual winding and the presence of KIF Shock Protection. The movement was commonly used during the period around 1965.