I purchased this around 2008 from a used clothing store. It's a remade coat, cut from the thigh area of herringbone fabric overalls (coveralls). Based on the CONMAR zipper and Sanforized buttons, it's likely from the 1950s or 60s. Originally, the front placket only has a zipper on one side, so it fastens with a single button on the chest. Please note that this is a vintage item, and there were some stains and tears from the time of purchase.