You would need to send the poster to posterfix. He told me that this is a small fix. Also all of the white folding lines would be gone. You may ask why haven't I done this. The reason is there seems to be a controversy among people on weather Linen Backing is better for the value of a poster or keeping it in it's raw vintage form.
Once the poster is Linen Backed it will look brand new. However the poster will have to be framed within a reasonable amount of time. You can take a look at their Linen Backing work at posterfix_com They are located in NY. Own a Piece of Movie History. The item "REVENGE OF THE JEDI 1983 STAR WARS Original 27 x 41 One Sheet Movie Poster" is in sale since Friday, April 5, 2019.
This item is in the category "Entertainment Memorabilia\Movie Memorabilia\Posters\Originals-United States\1980-89". The seller is "jackstreasurechest" and is located in Philadelphia, Pennsylvania. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Bolivia, Sri lanka, Luxembourg, Uruguay, South africa.