Seven Keys to Baldpate (1925 film)
Seven Keys to Baldpate is a lost 1925 American silent film based on the mystery novel by Earl Derr Biggers and play by George M. Cohan. Previously made by Paramount in 1917, this version was produced by and stars Douglas MacLean. Out of several adaptations of the story made between 1916 and 1947, this film is one of the few lost versions.
Source: Wikipedia