The Lip T15A is a mechanical watch movement that features a manual-wind chronograph with 60-second and 30-minute subdials, which are activated through a cam switch mechanism. It also includes a sub-second display. The day and month functions can be set using a pusher located at 10 o'clock, with the day requiring a deeper push compared to manual setting for the month. Additionally, the movement incorporates a date hand that can be adjusted using a pusher positioned at 8 o'clock. The Lip T15A movement was predominantly used during the approximate period of 1950.