My '59 came with a speedo/odometer that currently has 13000 miles showing on it. Do I think it's the original miles? No. (Maybe it's 113000, maybe 213000, or maybe it's something else altogether). Unless there is a chronologically unbroken string of 50+ years of maintenance receipts with documented mileage entries, I don't particularly believe any mileage showing on the odometer for any 50 year old car. Nor do I think it particularly matters.