I found a loose part number label in my box of bits. It says: G.M. Delco Radio, Service Model 80BPBI, Serial No. 8AR 076381, 12V Made in Canada, Prod. No. 16000420.
Could this be from a radio speaker or ? Whatever it's from, what year would it be? The label is 1" wide and 2" long. Thanks for any light you could shed on this.