The science-fiction strip ran in England's Daily Express from Feb. 15, 1955, to April 18, 1974. In August, Titan Books released the collection Jeff Hawke: Overlord (ISBN 1845765982). George Hagenauer has commented on how to solve dating problems with British strips, so I'll note that in this specific era, strip #H-1723 was in the paper dated Oct. 9, 1959. Those with calendar programs can work out when these specific strips were published. (At this point, Jordan's friend William Patterson was scripting the feature and possibly helping to plot the tales, as well.)