Seiko Prospex Speedtimer SPB513 and SPB515: Release Date, Design and Features Explained

For most of its recent history, the Seiko Speedtimer name has meant a chronograph. The SPB513 and SPB515 break that habit: they are three-hand time-and-date watches with a countdown scale on a rotating inner ring, dressed in the lines of a 1972 Speedtimer. They are among the more interesting...