Serial number range: 1697001-3183700 (1959-1982, approx. 17,250 produced). Production by year: 1959: #1697001-1697750 (750 units); 1960: #1720001-1824000 (3,500 units); 1961: #1841001-1844000 (3,000 units); 1964: #2015701-2068500 (2,500 units); 1965: #2121151-2122650 (1,500 units); 1967: #2238001-2238200 (200 units); 1968: #2258401-2288950 (1,500 units); 1969: #2378901-2379900 (1,000 units); 1970: #2457501-2458500 (1,000 units); 1973: #2617101-2618100 (1,000 units); 1977: #2860801-2861300 (500 units); 1978: #2952201-2952500 (300 units); 1982: #3183201-3183700 (500 units).