The problem is if its a U.S. manufacturer, they all made hundreds of subcontracted pieces/parts pours for glass assembly companies for decades & nobody kept any records. Westmoreland & Tiffin made a variety of lamps for years, but trying to ID 90% of the lamps produced during this period is pretty difficult at best. Looks a bit like the Miss America pattern by Hocking or Westmoreland's version of it, but who knows.