I watched them apply painted stripes to Acclaims/Lebarons/Spirits on the Newark Delaware assembly line about 1990 or so.I think his comment was not directed at Cordoba 300s but meant in general for the Chrysler Corporation.
In which case, not including 300 Hursts, I think it was 1974...but don't quote me. I know for sure I've seen NOS Formal pinstripes at swap meets.
Interesting procedure... Two people would lower the jig onto the car and one would walk down the length of the car with what looked like a Bugler stripper. They would hit a clamp that released part of the jig and the other walked the length with another stripper (or is it striper?) and paint the other stripe.