Does anyone know how I might find out information about the original
owner of a very old car, based on the license plate number?

Here's the situation:

My grandfather's biological father was cut out of his life when he was
4 years old. I mean quite literally cut out -- great-grandma cut up all
the family pictures! And we have very little information about him;
just the name from grandpa's birth certificate. One of the old photos
does have a car, and a license plate clearly visible, from around 1920.
I was hoping the vehicle records might show an address or maybe some
other information to go on.

Any thoughts?

thanks, Katy