This Site is essential:
Vintage Airstream Photo Archives
scroll down to what you think you have and then click on the model and there will be photos and serial number information . . . and then 4 hours later you'll say whoa, time flies when you're having fun. We look forward to seeing photos . . . good luck.
. . . but it won't give you specific info on your trailer . . . and now I see that someone already gave you that link (editing on the fly so to speak, I guess 'cause no one else has posted comments, I can still edit my post)