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The one in the dash is probably the original. It wasn't uncommon for there to be 4 radio options in the late 60s: radio delete, AM only, AM-FM, and AM-FM-8 Track. Some brands had separate 8 track players that hooked into the head unit.
If that car was optioned with an AM radio it's possible the "radio" on the steering column (GM never did that in the US post WWII) is an aftermarket FM converter that basically heterodyne FM down to the AM band for AM slope detection.
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