Last Chance to see what is hailed as the most important Titanic artifact discovery ever made. The legendary violin played by Wallace Hartley, bandmaster of the RMS Titanic, as the "unsinkable" ship went down in 1912 will be on exclusive display August 1-15 at the Titanic Museum Attraction in Branson, Mo. before it is moved to England to be auctioned in October. According to John Joslyn, the expedition co-leader of the first private exploration dive to the Titanic and owner of The Titanic Museum Attractions…