From 1962-69, my dad had a gunsmith shop in Corona, Queens. He was a licensed gunsmith, and had an unrestricted pistol repair license that allowed him to do work for the NYPD. At that time, John Jovino and Charles Greenblatt were both located on Center Market Place. My dad dealt with both businesses. I know for a fact that he did pistol repair work for John Jovino, but I don't know the nature of his relationship with Charles Greenblatt. Does anyone know whether pistol repair was done through Greenblatt or were they only involved in sales?