●Unused storage item from the 1970s. ●This is a manual for the Seiko 5 Sports Speed-Timer. ●A rare collectible from the Hattori Watch Company era. ●SEIKO 5 Sports Speed Timer Book NOS. ●Covers Calibers 6139, 6138, and 7015. ●A guide for chronograph models like 6138, 6139, and 7015. ●Recommended for those interested in vintage Seiko Speed Timers. ●It is palm-sized.