1440H, 1440M, 1540H, 1540M, 1640H, 1740H, 1840H, 2040H, 2248H, T40M, T40H. Toothed Deck Drive Timing Belt for Mountfield Lawnmower. The double sided type (teeth on both sides) being very common in twin blade deck drives, ensuring the timing of the blades is kept constant to avoid the blades clashing.
