During the 1970s my aunt worked at The Civic Light Opera in Downtown Los Angeles in the Public Relations Department. It was part of her job to distribute these original heavy cardboard Posters.  Most of them were put on Wilshire Blvd. in Beverly Hills in the department stores like Saks.  This measures 14″ by 22″.  It is in excellent vintage condition.  This one is From 1973 for Gigi Gone with the Wind Oliver and  two gentlemen from Verona Los Angeles Civic Light Opera Music Center Dorothy Chandler Pavilion  ( sorry if there are shadows in the photo it’s my photography)