Treasure Island font here refers to the font used in the poster of Treasure Island, which is a 2012 TV miniseries adapted from the novel Treasure Island by Robert Louis Stevenson.
The font used for the movie title is probably Caslon Antique designed by Bernd Nadall in 1993. The font is a commercial one and you can purchase and download it here.
Download Caslon Antique Font
The Caslon Antique font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.