14 digit is the old format. Here is what they mean.

First 3 are chassis #

Next 3 are model #

Seventh digit is 1 for LHD, 2 for RHD

Eighth digit is 0 for standard trans/ 2 for auto

next 6 digits are serial#


Example:

113.043-10-000213
.... is a 1967 250SL/ LHDwith a standard trans.. it was the 213th one made ...and it's mine.