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It's aMercedes-Benz 190 SL
All autos have a 17 digit Serial or VIN # by international agreement
Many local used car lots have a wide selection of affordable used cars. In addition, one can consult specialty web retailers like Yahoo! Autos, AOL Autos, CarsDirect, and CarGurus for deals on second hand cars.
In the category of Autos I know nothing it stands for.
SL derives from the German "Sport Leicht" or "Sport Light" in English.
It might stand for Salt lake City but usually there is a t on the end.