Two Merry Adventurers (1937)

Hans Albers and Heinz Rühmann play two confidence tricksters. They manage to stop a night train for nefarious purposes, and impersonate Sherlock Holmes and Dr Watson. Romantic involvement with two young British female travelers ensues, but the plot deepens into the disappearance of rare Mauritius postage stamps which they undertake to recover, in their role as Holmes and Watson..