Hello to you in South Carolina. Congratulations on your purchase of this vintage Airstream. You will likely have years of fun and frustrations with the thing. I think the Overlander was a very popular size then, and still is.
There are others who decipher VINs better than I, but I will try. I see it is a 27 foot Jackson Center built trailer, double bed. I think the leading I might stand of International trim level. Does your trailer have an International symbol on the sides? I don't know what the 0 stands for, but it is the 113rd trailer built that model year.
Now, 1969 was a very unique year. It is the first year of the new body style. My 66 Trade Wind 24 foot looks like a "twinkie". The new body style in 69 looks more rounded, like a loaf of bread.
The 69's had unique front "wing" windows. They have a square corner on the bottom outside edge, and a rounded corner on the top, outside edge. My son has a 69 Globetrotter with the square corner windows. Here is a photo showing what I mean. Unfortunately one of his shattered for no apparent reason. They are very hard to replace. The 1970 trailers had both corners rounded, which was the window used until the mid eighties.
So if your trailer has square corner front wing windows, it is definitely a 69.
PS My "phone photo" is rotated 90 degrees. Sorry about that.