SVgal

Hi all, I picked up this machine at the Goodwill. I'm hoping to use it as a sit down longarm. It has a hopping foot. It is a 18" throat. It's stamped PSM underneath and has a Sears Kenmore motor on it. Has anyone ever seen one of these? Any idea of the age? And, does anyone know what size needle to try in it? I'm drawing a blank when I google everything associated with it. It runs well. Thanks for any information anyone can give me.