We have three Harry Clarkes, but I don't think this is any of them. we have details for, he was born in 1856. He had a son, also called Harry, we have no dates for him, but he must have been born before his father died in 1951. His younger brother [[titanic too, so that narrows it down and rules him out. We also have Harry C Clarke, with no DOB, but his father is James Cole Clarke 1866-1938.