Kevin, I was coming at his post from a car dealer point of view--you are right in saying that if no fraud is intended, then it probably does not matter too much.
Suffice it to say that these cars are so old, it does not matter what the odo says. In other words, if you are in the market for one of these cars, do you even care what the mileage says anyway since the odo only has 5 numerical places, not 6? I never did.
CA DMV does keep track of the odometer readings every time a car is sold. If someone changes the mileage reading, there legally must be a "statement of facts" given to DMV. However, when a car is really old, they can't verify it's 100% correct anyway. My $.02
Davy