WDB: "W" for West Germany, "DB" for Daimler Benz.

Next letter, "C" in your case, indicates chassis. A is 123, B is 107, C is 126, D is 201, E is 124, and so on.

Next letter, "A" in your cause, indicates gas or diesel. A is gas, B is diesel.

The next two letters indicate the chassis code. 33 is the 380SEL I believe.