SEIKO PROSPEX COLLECTION: Seiko pioneered several features in diverÕs watches that are now widely accepted as setting the global standard, including the ÔaccordionÕ or corrugated style strap, the wide arrowshaped hands for extra legibility, and the two-piece case construction for added security. Similarly, in aviation watches, Seiko invented the trigonometric slide rule that allows pilots to make complex calculations in flight.