Factory windows were two windows each side. Yours were most likely aftermarket fitment rather than dealer. Many people bought a windowless van only to find they are a mongrel to reverse parallel park so would take the van down to their local glass guy to have windows fitted. I have seen plenty of vans with just a front window either side like yours... I have also seen one front window only on the left side.
Windows might not look as good, particularly on a Sandman but they make the car a lot easier to drive.
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