You don't know and chances are you never will know. Records from the 60's and 70's were paper and probably long gone. Even if the records are around, you probably can't access them.
While there are honest sellers out there, there's a lot that aren't. Then you have some sellers that are repeating what they believe is the truth or just repeating what they were told.
All you can do is look at the overall condition of the car in question.
I like your reply - there are a range of vendors on the spectrum. Most people probably rely upon what they were originally told in terms of millage. In the absence of more reliable information, I would probably fall into that category.
You guys had such great technology, even back in 1969. Since joining this forum, I now have to save up to buy a 1969 Imperial. I know it will be money well spent.
Sadly, our automotive manufacturing in Australia ceased in 2017. While we manufactured a supercharged V8 that covered the quarter mile in 12.1 seconds (
HSV GTS Gen-F specs, 0-60, quarter mile, lap times - FastestLaps.com), it didn't have features including the self-dimming high beam lights some Mopars had in 1969.
This discussion has highlighted one feature we in Australia were more progressive on - we introduced the six-digit odometer almost 10 years earlier than you guys. It was certainly not because we were more technologically advanced. Volvo introduced six-digit odometers a year or two earlier than we did in 1969 (
First cars with 6 digit odometer).
Given Buzz Aldrin had already landed on the moon by that time, the addition of an extra digit on an odometer probably wasn't a technological challenge for you guys. If you can successfully land on the moon, pretty sure you could put an extra digit on your odometers (if you wanted to).
My speculation is that the protracted retention of five-digit odometers for such a long time in the US was a marketing strategy to maximize the residual value of pre-owned vehicles. Even 50 years later, we don't (and can't) know how far our vehicles have really travelled (including mine). 30,266 miles kinda looks better than 130,266 miles, or 230,266 miles, or 330,266 miles and so and so forth....
Two generations after the manufacture of US vehicles, many (if not most) advertisements say 'original miles'. That may be right or it may be wrong. As we say in legal circles, what you don't know can't get you in trouble.
But if you said anything misleading about the odometer in Australia, a $50,000 fine applies. If you search Australian Chryslers for sale in the late 1960s and 1970s, many have done between 185,000 miles to 320,000 miles. It is simply impossible to get US Mopars of the same era to display that sort of milage because the recording mechanism was (in my respectful submission) quite intentionally limited in it's range (of a maximum of 99,999 miles).
A family friend's Valiant of that era even clocked up 620,000 miles. Without the addition of that extra single digit on the odometer, it would simply display 20,000 miles.
Australia and the US are similar in many ways - including in terms of land area - so it is somewhat odd that Australian Chryslers tend to travel many, many times further than US Chryslers. Are Australian Chryslers any better than US Chryslers?
Having driven both, I can confirm they are pretty much the same. Your roads are much better - but that doesn't help explain why so many Australian Chryslers have accumulated hundreds of thousands of miles, whilst almost every US Mopar has less than 99,999 original miles.
Having driven all over the US and Australia, I would say our interest in cars and driving preferences are very similar. You guys like big cars that go fast - just as we do.
To show my hand, I doff my hat to your automotive marketing teams. Leaving out a digit on the odometer for so long was marketing genius. I admire the way you guys got away with it for so long. I can never know whether my Chrysler has driven 30,662 miles or 1,030,662 miles. Putting ethics to one side, it is simply great marketing.
And the credit is not just with Mopar, all the other manufacturers including Ford and Chevrolet were obviously doing the same thing - no doubt sharing a Budweiser or two over a long lunch