Sharing its engineering with the R121 190 SL of 1955 , the Ponton was a stylish sedan with a four - cylinder engine .
The first modern midsize Mercedes was the W120 ' Ponton ' 180 of 1953 .
Sharing Mercedes ' engineering with the R121 190 SL of 1955 , Ponton Ponton was a stylish sedan with a four - cylinder engine .
The first modern midsize Mercedes was the W120 ' Ponton ' 180 of 1953 .