Desperately Need Code Sound System Code

[imran7706]

Hi There
I own this Mercedes Model E-300 1994 Diesel the sound system “Model DOLBY BNR Mercedes Special” refuse to start it asks the code to insert
Can some body out there help me out start the music system in my car or at least where do I approach to get the code?
Here is the number that appears on the sound system
EC 121
R 1090620
Mercedes Benz Special
003820 3186 [ 07]
Model No Special Be 1350 R 1090 620