It's not the greatest pic so I can't say for sure but it appears there may be some significant skin damage. Peeling clearcoat is one thing, but wrinkles and or corrosion is another. I also noticed that the battery box door is either left open or missing.
I don't think it's a '73 because the bath in on the curbside. My '73 has the bath on the streetside.
I have a lot of photos of my restoration here
Here's some buying advice that I still stand by.
Here's some more
There are two types of old Airstreams:
Those with major issues and those with major issues that have been repaired. (The third category is extremely rare...an original owner who has meticulously cared for it over the last 30 years.)
Don't be hasty, take your time, this forum is a great resource.