I heard the same thing but I've never seen it.I forget what year Chrysler started doing it, but they installed a little felt pad with ink on the odometer. When it turned over from 99,999.9 it put the ink stamp on the first zero. If you can, get the speedometer out and look at the mileage from the back side.
I have seen this over the years, it darkens the "0" not erase it. Also like "CBODY67" when we had to replace a speedometer, the new one would come in at all 00000.0. We would have to remove the drum and set the miles to the same as the old one. If you knew how to remove the drum, it was very easy to reset any odometer. What made it legal for the dealers to do was setting it to the documented mileage.In would think the ink would dry out long before the 100k mark.
Arm rest...…… Grain should match the rear arm rests pretty close on a 40K car. 140K should show substantial wear. Perfect likely means a replacement.
My 67 Polara has 86K documented miles and the drivers arm rest is slap worn out.
There were stories of some used car dealers putting the cars on jackstands and putting the trans in "R" and letting it run for a good bit. Or attaching an electric drill to the back of the speedometer head and running it backwards that way. But in either case, not a big lot of miles would be removed that way....snip...