Seiko Prospex SRPE33J1 Automatic Stainless Steel Men's Watch

Seiko pioneered several features in diver’s watch SRPE33J1 with caliber number 4R35 that are now widely accepted as setting the global standard, including the “accordion” or corrugated style strap, the wide arrow shaped 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.