1976-7 radio.
Transistor date calls out, 1976 7313562 (x)2FFPK1 (where x is the year, 2 (Pontiac), F (body style), FP (AM/FM push button with K (fader, rear speaker) and 1 (current revision)).
1970 Firebird AM/FM (non-Fader) on eBay.
https://www.ebay.com/itm/236712612303