Well that ebay seller posted these two photos with an explanation why his listing is a 1969 radio as seen in the link below:
https://www.ebay.com/itm/362993875951?
It shows the face plate difference on the right control knob, longer buttons and if you look where it says Delco on the dial face, it is on the bottom for 69.
The other picture is a 70-75, note the faceplate on all 70-77 are raised on the right control, the buttons are shorter, and the Delco is on the opposite side of the dial face.