owner: Jeff Miller / firstname.lastname@example.org
The chassis number found on Plate A (121.011-10-75-12770) shows it was the 12,770th Type 190 since the beginning of production (3/56). Plate B (on the door) says, "Mercedes-Benz Karosserie A121011 7502817". This indicates a W121 (Type 190), and the 011 means it has a sunroof. The 75 means 1957, and the value of "02817" may indicate it was the 2,817th Type W121 sunroof sedan produced in 1957 alone — the Data Card shows it was delivered new on July 17, 1957.
There were 61,345 Type 190 sedans produced by Daimler-Benz between March 1956 and August 1959. For members of the U.S. armed forces as of September 4, 1956 - a Type 190 Ponton sedan with sliding sunroof cost $2,275.25 (USD) in Stuttgart.
All new cars registered in Germany between 1936 and 2004 were issued an official (legal) booklet called a Kraftfahrzeugbrief. It was a log that contained the names, addresses, and occupations of the people who registered the vehicle. According to the original Kraftfahrzeugbrief of this 190 sedan, it has endured 10 owners.
Mercedes-Benz chassis 121.011-7512770 was delivered new in Berlin on July 30, 1957. It was shipped to the USA in 1980 from a US military base in Ansbach. In 1986, it received a restoration that included paint (original DB40 black), headliner, windlace, upholstery and sunroof. Today, it only sees light duty around town and in classic motoring events during the spring, summer, and fall of the year.
The Spartan interior of the Type 190 Ponton sedan features a modest wood strip at the top of the fascia. The main dash, with its unlabeled switches and controls are set in dark brown Bakelite. The section between the Bakelite and the wood is trimmed with vinyl. Note the column-change gear shift lever.
Blaupunkt Werke GmbH (Germany)
"Frankfurt" (K Series)
Serial Number: K150607
The radio in this particular car is a Blaupunkt Frankfurt, and the clock is an eight day wind-up model. On this 1957 Type 190 sedan, the turn signals are not self-canceling, and are operated by pivoting the center chrome horn ring to the left or right. The stalk, which is visible to the left of the steering column, is the high beam flasher. If the stalk is held down (or up) for 3-4 seconds, the high beams begin to pulsate automatically, in the unlikely event the driver would have an opportunity to contemplate overtaking a slower vehicle.
Took kit with reproduction canvas pouch
The vehicle's Data Card is the original build specification sheet (written in German) that lists the date of manufacture, as well as all standard and optional equipment installed at the factory. The data includes the interior and exterior colors, tire manufacturer, engine number, radio, and much more.
Data Card Translation
This particular Data Card specifies the Kraftfahrzeugbrief number (Kraftfahrzeug-Brief Nr. 8 964 092), which was also issued with the car when new.
This is the cover, and first two pages of the Kraftfahrzeugbrief issued with this Type 190 sedan in Germany when it was new. All new cars registered in Germany between 1936 and 2004 were issued this official (legal) booklet. It was common practice by the German registration authorities to cut the bottom corner of the Kraftfahrzeugbrief when the car was exported. The Kraftfahrzeugbrief was then no longer valid. If the car had been imported to Germany again (before 2004), a new Kraftfahrzeugbrief would have been issued. Behind the booklet in these photos is a vehicle safety inspection document printed on the back of a German road map.
Beginning June 1, 2004 a different log book that conforms to European Union (EU) standards was issued with each new car in Germany. The former "K-brief" held enough spaces for six owners. The new EU document only contains enough space for two owners, making it more challenging to chronicle the vehicle's history.
July 30, 1957 / Registered to its first owner in Berlin, Germany
Fa. Heliowatt Werke Elektrizitäts AG
Wilmersdorfer Str. 39
As of December 2001, the company (Fa. Heliowatt Werke Elektrizitäts AG)  still existed in the same location. 
November 27, 1959 / Registered to Hermann Eckstein in Erlangen, Germany
January 9, 1973 / Registered to Gunter Hahn (a student) in Ansbach, Germany
December 12, 1975 / Registered to German Haas (born February 15, 1920) in Ansbach, Germany
July 12, 1976 / Registered by a mechanic named Uwe Medla (born June 5, 1956) in Furth who stored the car in a barn in the countryside
May 10, 1979 / Registered by a U.S. soldier named Larry Atkins of Hindenburg barracks, (Ansbach) who drove it on the military base
At this point, all of the original Kraftfahrzeugbrief pages were filled. Some of the detail about the owners Uwe Medla and Larry Atkins, as well as the subsequent history was learned by meeting the man who shipped the car from Bremen, Germany to Rochester, New York in 1980.
In 1980, a U.S. soldier, SP5 Timothy S. Mueller (511th military battalion) bought the car from Larry Atkins and registered it in Bremen
August 19, 1980 / The 190 Ponton was shipped via the vessel "Atlantic Star" (Wallenius Lines ) by Timothy S. Mueller from Bremen, Germany to his brother Stephen K. Mueller in Rochester, New York
In the summer or fall of 1982, Andrea Snyder of Pittsford, New York registered the vehicle
In October of 1983, Thomas C. Littlefield of Penfield, New York registered the Type 190 Ponton
June 17, 1989: Jeff Miller bought the recently restored Type 190 sedan after photographing it for the previous owner (Thomas C. Littlefield) on the grounds of the George Eastman House in Rochester, New York.
These modifications were made before it was shipped to the U.S.A. in 1980.
The original 1.9 liter, four cylinder gasoline engine (121.920) was replaced some time prior to arriving in the USA with a four cylinder, 1.9 liter (1,897 cc) (121.923) gasoline engine. The 1.9 liter (121.923) engines were originally used in both the Type 180a (1957-1959) and 180b (1959-1961) sedans.  The 121.923 engine (in this car) is fitted with a Solex 34 PICB carburetor (correct for a 121.923 engine). 
A requirement for driving the car on the US military base in Germany was to have seatbelts. They were not part of the vehicle's original configuration, so front seat belts were fitted.
Fender Running Lights
The amber Type 219/220S style fender running lights have integrated blinkers. These lights were available as accessories and could be fitted by authorized Mercedes-Benz agents as an extra cost item. The four cylinder models such as this model 190 sedan could NOT be ordered directly from the factory with these lights. Daimler-Benz did not look with favor on making such modifications.  Also note that the non-export models, such as this Type 190, did not include the small round "bee hive" blinker lights below the head lights as found on models destined, for example, for the USA market.
Original Hella fog lamps found on Ponton sedans are usually round. This car has the Type 190SL style Hella fog lamps, which are rectangular.
On the later (1959-1962) 180b/190b sedans, the rear reflectors migrated from the lower portion of the bumper guards (as this car retains) to the bottom of the tail light clusters. This 1957 Type 190 wears the the later "b" style tail lights (a modification made by a previous owner in Germany), thus giving it reflectors in both locations.
 The Heliowatt-Werke were founded as ARON-Werke by Dr. H. Aron to build power meters for houses that gauge electrical consumption. The name changed to Heliowatt-Werke in 1933. They were taken over by a company called "Schlumberger" in 1995, most of the personnel had to go. For some time in the past, they also seem to have built radios under the trade name "NORA" (reverse for "ARON", the former company name).
 Thanks to Stefan Knappe (Germany) of the Mercedes Veterans mailing list for deciphering the handwriting in the Kraftfahrzeugbrief and providing the Heliowatt-Werke history. December 30, 2001
 Wallenius Lines has since the 1950s been a leader in the ocean transportation of vehicles and other rolling cargo
 Hartwig Mueller / December, 2001 / Mercedes-Benz salesman in Germany from 1956-1964
 Photos: June 16, 2001 / 20:35 hrs. (UTC +4) / Black Sparrow Photography ™
 Mercedes-Benz Technical Data / December 1957 edition
 The Solex model "34 PICB" carburetor was original to the 121.923 engines of the Type 180b sedans