Treasure Island is a two-part British television drama adaptation of the novel Treasure Island (1883) by Robert Louis Stevenson. It follows the story of Jim Hawkins, who's unexpectedly drawn into the world of piracy upon discovering Flint's treasure map.
The Treasure Island title on the poster features Caslon Antique designed by Bernd Nadall in 1993. The font is a commercial one and you can purchase and download it here.