Serial number range: 812242-3980588 (1950-2004, approx. 3,600 produced). Production by year: 1950: #812242-813231 (990 units); 1961: #1854001-1854110 (110 units); 2002: #3953751-3954750 (1,000 units); 2003: #3967791-3968790 (1,000 units); 2004: #3980089-3980588 (500 units).