Good find David. in the classification system used by Bob Ensminger, the barn shown here is a Pennsylvania Barn and not a Sweitzer, there are clear differences, in fact they are different categories. The framing layout is clearly from a later era of construction, where economy of construction has simplified the layout to the point where basic concepts of support are lost. On the note of loss, the structural core of older PB's were organized to bear the roof load away from the forebay wall onto the foundation, so the single interior post is an outlier.