Serial number range: 2718151-3950033 (1974-2002, approx. 20,200 produced). Production by year: 1974: #2718151-2718650 (500 units); 1976: #2766501-2768000 (1,500 units); 1977: #2832351-2834350 (2,000 units); 1978: #2904801-2906800 (2,000 units); 1979: #3007151-3009150 (2,000 units); ... ; 1996: #3754126-3754625 (500 units); 1997: #3783830-3784329 (500 units); 1998: #3836875-3837374 (500 units); 2000: #3883247-3883746 (500 units); 2002: #3949534-3950033 (500 units)