1963 to 1989, The Complete Evolution of the 911.
In 1964 the 'O' Series goes into production with type number changed from 901 to 911 through to 1989 when the 'K' Series brought the 26 year 911 chassis designation to an end.
WPO ZZZ 91 KS 1 brings it to an end ... long live the 911
Chassis code 10 or 12, the Coupe was from the original 901 design from the pen of Alexander 'Butzi' Porsche.
Chassis code 14 or 16, introduced in 1965, the Targa saw the 911 with a removable lateral roof panel.
Chassis code 15 or 17, introduced in 1981, the Cabriolet saw the 911 with a soft-top roof neatly retaining the Coupe lines.