Conan Doyle H251
From The Arthur Conan Doyle Encyclopedia
Conan Doyle H251 was a Hull steam trawler named after Arthur Conan Doyle. H251 referred to the port registration numbers for fishing vessels : H been the port of Hull and holding the registration number 251.
Built in 1937 (Arthur Conan Doyle didn't know it) and scrapped in 1966. Technical specs at Hulltrawler.net.