Not available in the uk limited edition of 700 pieces seiko watch prospex marinemaster professional 1000m hi beat 36000 limited edition prospex marinemaster celebrates 50 years of seikos divers watch excellence it was in 1965 that seiko made its first ever divers watch half a century on the list of seikos achievements in this most challenging of arenas for watchmakers is long and distinguished from the first use of a titanium case for a divers watch to the invention of the accordion style