Thanks Bryan, is there any way to find out what year it was made?
If it's still on the radio, they used to put a sticker on them with month/year of manufacture. A lot of the little tags fall off as the adhesive looses it stickiness as the radio is heated by use, and cools down.
There is a guy that does Delco radio repair: <
http://ronsradio.com> . He may have a listing of PN's correlated to year.
This a ETR Delco radio I bought as a spare for my '88 GMC V-Jimmy in 1997 at a swap meet. It came out of an earlier Corvette (Notice the black knobs). The shaft dimensions are identical for Vettes and trucks in this era.
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The tags were still attached when I bought it, but were losing their adhesion, so I taped them on to keep the tag historical info.