Thanks for the info!The knobs are surely 68/69 Plymouth style. The Automatic Radio Manufacturing Company produced many models of radios. Although I could not find this specific radio on the page I was looking at. It most certainly is after market and a for 68/69 Plymouths. Since there are not too many cars that had the thumbwheels.
You can look through this page and the following other pages to see if you can find it.
https://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=1932
Or this link.
https://www.radiomuseum.org/m/automatic_usa_en_1.html