Fascinating and interesting to say the least! The Barracuda build date was Mar 23, 1965 in Detroit. Here is the one from my 65 Dart wagon, build date late Jul 65 in LA. It would be interesting to know the build date of Johan’s sedan and where it was made.
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It could be the factories starting getting the new for 66 handles in mid year and started using them when the old supply was exhausted or could yours be a leftover from 64? We will never know!