The Mido 1014B is an open face calibre movement featuring a Breguet hairspring and a negative stem mechanism specifically designed for the US market. These movements have a consistent layout for the base plate and bridges, but come in various heights and stem mechanisms, including one with a larger diameter for US cases. They are typically marked with their diameter in lignes and height in 1/12 lignes, or with a newer 3-digit designation. The Mido 1014B movement offers functions such as stem winding and setting, a sub second display, and the capability for reverse winding.