The actual publication date is unknown. However, the title page reads 'Author of "The Meaning of Paul for Today"'. That volume was published in 1920. It also says that Dodd is at Oxford, a position which he left in 1930. The the publication must be sometime during the 20's. If you know more details about Dodd you might be able to narrow this further. It reads "Professor of New Testament Greek and Exegesis at Mansfeild College, Oxford". Given that a job would probably change over 10 years we might be able to narrow it more. Please feel free to contact me if you know more.
Steve Morrison. Sydney, Australia.