Serial number range: 1972001-3587959 (1963-1992, approx. 55,200 produced). Production by year: 1963: #1972001-1995500 (600 units); 1964: #2020001-2065500 (6,000 units); 1965: #2099901-2154900 (1,350 units); 1966: #2168701-2203100 (8,000 units); 1967: #2252401-2254400 (2,000 units); ... ; 1982: #3234301-3235300 (1,000 units); 1984: #3299201-3334200 (3,000 units); 1985: #3360801-3362800 (2,000 units); 1990: #3513796-3514795 (1,000 units); 1992: #3586960-3587959 (1,000 units)