Hi,
I can't be totally certain if the same applies to the 1970s, but in the 1960s it was common for Triumphs (and other cars) to be registered in the year they were sold for the first time, not by the year they were actually built. For example, my TR4 was built in late 1962, but sold in early '64. So it's registered as a '64.
One reason was that this way the manufacturers and dealers got around having to discount and sell off "last year's" models. Of course, back then the models tended to be quite similar for a lot longer than today's cars, which seem to be redesigned about every 3 years, minimum. I suppose this is done today to encourage everyone to trade "up" often so they can keep up with the neighbors and have the "latest and greatest".
It wasn't until the 1980s that VIN # formats became standardized, for example, so I would suspect some (a lot?) of this occured during the 1970s, too.
On the other hand, regarding today's frequently re-styled cars... Seems to me they might be running out of ideas.
I personally think it's possible a lot of today's automotive "styling" is actually being done by one-armed, half-blind chimpanzees locked in a cage with a bunch of shoeboxes, Scotch tape and crayons until they come up with something. My apologies to the poor chimps.
There's gotta be a huge cost savings to the manufacturers that avoid using trained and experienced human stylists, who might have original and attractive ideas, but unfortunately want to be paid with something more than bananas!
Gettin' down off my soapbox now!
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