Just got through doing some reading on this subject as a matter of fact and the range of value on that era car is anywhere from 20-35k obviously dependant on condition. If it is a 190 it will fetch the best dollar value of the roadster from the 55-63 era.

I am sure there are alot of folks with hands on experience with these classics, but that is what I recently read on the subject.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners