Can someone tell me the decoding of my 1988 300CE VIN: WDBEA50D7JA752792

Also, my Becker radio (Becker 780 Grand Prix) has ==== across the front. Is there a code required for this radio? I have the original Owners Service and Warranty Policy booklet. Inside there is a Warranty Registration Card with the VIN, original owner, and some other information. Included in this information is a code: 672682

Would this code be for the radio? If so, how do you enter this code or what is the key sequence besides the code? Do I need to press any other button or do I need to press a button to get the radio into the mode to receive the code? Thanks in advance for you help.

V/R,
Kurt

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1967 Dodge Coronet R/T (SOLD)
2001 Volvo S80 (Accident; bought by Insurance)
1996 Volvo 850 Wagon (SOLD)
1982 Mercedes Benz 240D (Accident; bought by Insurance)
1988 Mercedes Benz 300CE (Deer Strike; bought by insurance)
2002 Volvo XC70
1985 300 CD