On my 1961 ford thunderbird the #481 was painted on the pasenger side iner fender is this factory and if so y?

That is not factory,but depending on how it got there it might be something important.The car could have been built as a special order for Ford internal testing or use,or maybe as a race car that never was or ';celebrity'; car.Or it might mean absolutely nothing and was put on there by some owner.But I wouldn't modify the car or take the number off until I found out for sure.That car could be very special and very valuable.And anything you do could hurt that value.I would contact the Thunderbird Club of America and ask them for advice and help in finding out if the number means anything at all.

human hair