The serial number on the Becker Grand Prix radio that came with my gray market (euro version) 1984 MB 380SE is not accepted by any of the on-line code retrieval services I tried. There is a German language sticker on the back with an English sticker pasted over it as follows:
Brand: Grand Prix Electronic Model-No. 612 Serial-No. HS6205573 FTZ-Nr. 21/560 S Please help with the unlock code. Thanks