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.../...My car was delivered with and has the Becker Grand Prix radio.../... Would this be considered the higher end option.../...
Looking at the Tech Manual, this one seems to have a few different features.
One can usually tell the cars originally shipped without radios because there are no copper spring fingers at the hood latch to ground the hood.
Except many cars (such as my former 250 SL) came from the factory with the "radio suppression kit" but no radio. Setup for the dealer to add the radio. It had the copper spring fingers, etc.