Hi and welcome to the forums. I believe that windows are no longer avalaible for this trailer but you might find some old stock somewhere. I would start watching e-bay and craigslist for a used one from someone who is parting out a trailer.
Use the search tool (upper right corner) and search for argosy window. You should get some results that will provide you with more info. Several forum members have replaced these windows.
__________________
1964 Globetrotter | 2023 Nissan Armada
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.