I suppose they could have been reused from somewhere else.
In one of my crawl spaces I have a few sashes which don't look anything like any of the windows in the house. They are 6 pane and use stables nailed in on an angle to hold the panes of glass in. Not sure why they would be made this way, I assume they are probably from an old shed or something? Or was there a time when windows for houses were actually made using nails \ staples to hold the glass in?
