The Prospex re-creation of this 1965 classic is faithful to the original design, but thoroughly up-to-date in its technology. It incorporates Caliber 8L35 which was specially designed for diver’s use and is made by Seiko’s skilled craftsmen and women in the Shizuku-ishi Watch Studio in Morioka in the north of Japan. The overall re-design was entrusted to Nobuhiro Kosugi, a recipient of the prestigious Medal with Yellow Ribbon and Contemporary Master Craftsman awards. Kosugi has kept faith with the original, as is attested by the 3D embossed hour markers which stand up in sharp relief and yet are an integral part of the dial itself, the luminous dot at twelve o’clock, the slim profile of the case and the narrow bezel. The case is virtually identical to the original, but its diameter has been increased by 1.9mm.