Greetings Taylor!
Welcome to the Forums and the world of Vintage Airstream ownership!
Your windows are definitely different from those in my 64 Over lander. They look more like those that I have seen in
1965 Airstreams. There are numerous possibilities such as the coach being a very late
1964 production or an early
1965 delivered and titled in
1964.
Good luck with your investigation!
Kevin
P.S. -- A big difference between
1964 and
1965 would be the entrance door -- a 64 would have a door-within-a-door while a 65 would have a solid door with separate screen door.