Sounds to me like it is a 1968 Safari
built in CA. A picture of the data plate would confirm it - but I believe the second "0" is actually a bad "S" impression.
The price is dependant on the condition and what's "there"...but it sounds like "As Found" would pretty accurately define the condition based on your description. Here are some Price vs Condition
guidelines which will help clarify the value. If you have some pics to post, I'm sure we can give you some additional information - but from your description it sounds like it could have some hidden issues depending on how long the windows have been missing - the floor could be shot. If you aren't handy and ready for some projects, you may be better off looking for a different first trailer.
If it is a '68, they have Corning windows which are pretty cool but can be tricky to find, search the forums for more info on window replacement options.
Good luck in whatever you decide to do ~