I thought of this after posting .... I would say the "round headlight" models, spanning all of the models up to but not including the latest model series.

Thanks for the observation.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)