* Make and Model: A Ford Model T will be far less expensive than a luxury car of the era from a brand like Pierce-Arrow or Rolls-Royce.
* Condition: A fully restored, concours-condition car will command a price many multiples higher than a rusty, incomplete project.
* Rarity: The fewer examples remaining, the higher the price.
* Completeness: A car with all original parts will be worth more than one needing significant restoration.
Because of these variables, you'd find vastly different prices—from a few thousand dollars for a very rough, incomplete Model T to hundreds of thousands, or even millions, for a meticulously restored luxury car in exceptional condition. There's no reliable database that tracks the average sale price across this wide range of possibilities. You'd need to check auction results and specialist collector car websites for specific makes and models to get a sense of value.