The W110 is a line of mid-size primarily inline four-cylinder executive cars produced by Mercedes-Benz between 1961 and 1968. The company's basic line of for much of the 1960s, it was part of Mercedes' unified platform of "Fintail" (German: Heckflosse) models – first introduced as a six-cylinder Mercedes W111 in 1959.
The 190c and 190Dc sedans debuted in April 1961, replacing the W120 180c/180Dc and W121 190b/190Db. The gasoline-powered 190c was fitted with the 1.9 L M121, an upgrade from the 1.8 L M136, and the 190Dc the 2.0 L OM621 diesel, an upgrade from the obsoleted 1.8 L OM636.
The W110 line was refreshed in July 1965, with an engine displacement increase to 2.0 litres and a second carburetor giving more power to the new gasoline 200 model that displaced the 190, and an improved already 1988 cc diesel fitted in the new 200D that replaced the 190Dc.
The W110 range gained a new model, the 230, a downscaled version of the 6-cylinder W111 220S (with the commensurate new 230S replacing the W111 line's 220Sb and 220SEb).
Production of the W110 lasted just three more years, until the W114 '220' and W115 '220D' introduced in 1968.
The Mercedes-Benz W110 and the six-cylinder W111 were the first series of Mercedes cars to be extensively crash tested for occupant safety.
--copied from Wikipedia
