Originally Posted by 66Overlander
1. It's got 7-panel end caps. All you need to see is where the first seam goes. Since it is not higher than the top of the side windows, it has seven panels. That first seam would be above the side windows if only 5 panels like a '64 and after.
Least anything I say being considered an absolute (and there are very few absolutes in Vintage Airstreams), I must also correct my self slightly on this point. The seam on 5-panel endcaps is always above the top of the side windows from 1964
onward, but there are cases in 1957
to 63 (tending more toward the early part of this time period, I think), where the first seam is at or above the top of the window even with 7-panels due to the side windows being positioned lower on the sides of the trailer.