Serial number range: 2785651-3617888 (1976-1993, approx. 11,502 produced). Production by year: 1976: #2785651-2786150 (500 units); 1977: #2817351-2862300 (3,000 units); 1978: #2881701-2935700 (5,000 units); 1979: #2989101-2990100 (1,000 units); 1985: #3371001-3372000 (1,000 units); 1991: #3562873-3563872 (1,000 units); 1993: #3617887-3617888 (2 units).