The Fontainemelon 64-2 watch movement is a manual wind mechanical movement that offers a sweep second function. It features a bimetallic screw balance and utilizes a Breguet hairspring. Notably, this movement is identical to the Gruen 835SS and Rolex 210 movements, all of which were manufactured by Aegler. The Fontainemelon 64-2 movement was introduced in 1925 and has been utilized in watches since then.