The German Tank Leopard
According to Wikipedia:
The design started as a collaborative project between Germany and France in the 1950s, but the partnership ended, and the final design was ordered by the Bundeswehr, with production beginning in 1965. In total, 6,485 Leopard tanks have been built, of which 4,744 were battle tanks, and 1,741 were utility and anti-aircraft variants, not including eighty prototypes and pre-series vehicles.
The Leopard quickly became a standard of European forces, and eventually served as the main battle tank in over a dozen countries worldwide. Since 1990, the Leopard 1 has gradually been relegated to secondary roles in most armies. In the German Army, the Leopard 1 MBTs were phased out in 2003, while Leopard 1 derived vehicles are still widely used. The Leopard 2 MBTs have taken over the MBT role. Leopard hulls have been re-used for a wide variety of purposes.