I remember seeing a 71 Charger R/T on the dealers lot with that stripe you described. The car I saw was B 5 blue. My parents bought a new 70 Charger R/T SE in late 70. The new Chargers had just arrived. I remember looking at this blue one thinking,i'm glad my parents bought the 70 and not a 71. If the car you are talking about has the correct stripe code on the tag or build sheet,for that wide segmented tailstripe,thats a rare option.