Since introducing its pioneering dive watch in 1965, This Seiko watches with caliber number 4R36 have maintained a rich legacy steeped in the exploration of the world’s harshest environments. If you love to wear watches, then this Round shape Watch for Men from Seiko is meant for you. This adventurous spirit led to the creation of a long-running series of watches whose “Prospex” endeared them to those who sought the venerable Japanese brand’s philosophies of unerring quality and dependability.