Serial number range: 1615001-2312750 (1958-1968, approx. 49,400 produced). Production by year: 1958: #1615001-1630000 (4,000 units); 1959: #1662001-1697000 (9,000 units); 1960: #1731101-1816000 (9,900 units); 1961: #1903001-1906000 (3,000 units); 1962: #1921001-1950000 (8,500 units); 1963: #2006001-2007500 (1,500 units); 1964: #2049501-2051000 (1,500 units); 1965: #2080501-2154550 (6,000 units); 1967: #2217201-2241000 (3,000 units); 1968: #2309751-2312750 (3,000 units).