10-29-23, 10:55 PM (This post was last modified: 10-29-23, 10:59 PM by mike1968rt.)
68-69, but not base trim. Standard was a metal button. Yours went on the optional 3 spoke with horn ring wheel. The photo is from the 1968 Coronet Illustrated Facts and Features manual. The three spoke was standard on the RT, the 500, and the 440.