E limousines were built as special orders. Chassis (F123) The stretched limousine version was offered with complete front body clip (B-pillar forward) and strengthened chassis as the base for ambulances or hearses to be built by the conversion specialists such as Binz and Miesen. F stands for Fahrgestelle (chassis). Estate (S123) At the 1977 IAA in Frankfurt, the brand's first-ever factory-built estate, S123, was introduced. The letter T in the model designation stood for Tourismus und Transport (Touring and Transport). Previous estates had been custom-built by the coachbuilders, namely Binz. S123 production began in April 1978 at Mercedes-Benz Bremen factory. All engines except the 2-litre version of the M115 were available in the range. Convertible While Mercedes-Benz never built its own convertible, they have been built by external companies such as Crayford in the UK, who built the St. Tropez models, and also by Niko-Michaels in New York, USA. In the city of Hagen, Germany, until 2016 one small family owned firm- Baehr, have produced cabrio versions of the C123 Coupe models, and also sold kits for cabrio conversions of the same model. Engine All engines from the W114/W115 are carried over. The single new engine was the SOHC 2.5-litre M123 inline six. The 3-litre, five-cylinder diesel engine received a proper nomenclature for the W123, matching the engine displacement: 300 D instead of 240 D 3.0 on the previous W114/W115. In the autumn of 1978, the power output of the 240 D was increased from to and of the 280 E from 177PS to 185 PS. In early 1979, the power output rose from to for the 200 D and from to for the 300 D. The 220 D was deleted from the model range for 1980. In June 1980, the new M102 four-cylinder inline petrol engine replaced the M115. The 2-litre version was only available with a carburetor while the 2.3-litre version was available with fuel injection only. The carbureted version of 2.8-litre M110 engine in the 280 and 280 C was discontinued in 1981 leaving the 250 as the sole carbureted six-cylinder inline engine. The world's first turbocharged diesel engine for a passenger vehicle, the OM617 A, was finally introduced in W123 models in September 1979, exclusive to the 300 TD TURBODIESEL for the European market. The same engine was offered in North America and Japan in 1981 as the 300 D TURBODIESEL, 300 CD TURBODIESEL, and 300