By the way , "TB3" is , indeed , Petty Blue .
Originally , in 1962 ( henceforth the "T" as the paint code's prefix ) , it was a special order colour , and limited to the south east sections of the U.S. ; it remained that way until 1972 . For 1972 , TB3 was renamed : "Basin Street Blue" for Plymouth , and "Super Blue" for dodge .
My '73 Duster was factory TB3 , a beautiful colour !