A friend brought over his grandfather's fedora to ask my opinion regarding cleaning and restoration. The hat's lining simple says Saks Fifth Avenue and the leather sweat band is stamped Leisure Flex Pat.2682175. He showed me a photo of his grandfather taken in 1949 wearing the hat. The hat is dirty with some sweat stains and discoloured ribbons but he wants to have it restored if it is worth it. Otherwise seems to be in pretty good shape. What do you folks advise me to tell him.