Answers: 126 chassis
Two possibilities. If the key is rectangular and flat it is a keyless step card for either an SL, CL, or S-class. If it is rectangular and just about two inches thick next to a blade that flips out it is for an older model ML, SLK, S-class, C-class, E-class, etc etc. These key were dropped on most models around 1998, but carried over contained by the 163 ML, and 170 SLK.
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