There is one factor that is consistently overlooked in determining the exact model year of most cars. The 'model year' of the car may be different to the date of production. Upto the early 50s, that was not the case but later the model year started in August/September. Meaning, a car sold in November 67 is officially designated by the factory as part of the 68 model lineup. It can lead to a lot of confusion.
Moreso, the 67 model Beetle was a one off, appearing only for that year. There were many bits and pieces that were unique to the 67. It was an amalgum of sorts. 67 was also the transition year for the headlight design. If im not mistaken, your car should not have the sloping headlights and fenders as well. (Am 99% sure on this, but you seem to have your research done so Ill leave some room for error ;-)
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