Seiko Prospex Diver's Watch 1968 300M Heritage Gmt 42mm Automatic Men's Watch
This heritage diver combines Seiko's 1968 diving legacy with contemporary GMT functionality in a 42mm stainless steel case. The Pacific Green ceramic bezel and matching dial create a cohesive aesthetic, whilst the in-house Calibre 6R54 automatic movement powers both standard timekeeping and a dedicated 24-hour GMT hand for second time zone tracking. The movement delivers 72 hours of power reserve and includes a stop-seconds feature for precise adjustment. Lumi Brite coating on the hands and indices ensures visibility in low light conditions.
The watch meets professional diving standards with 300 metres of water resistance, reinforced by a screw-down crown and screw case back. A sapphire crystal with anti-reflective coating protects the dial, whilst the stainless steel bracelet features a three-fold clasp with micro-adjustment capability for comfortable fitment across varying conditions. This watch balances historical design reference with functional complications suitable for travel and underwater use.
The Seiko Prospex Diver's Watch 1968 300M Heritage Gmt 42mm Automatic Men's Watch is listed on WatchShopper as a men's 42 mm stainless steel automatic GMT watch with a green dial, sapphire crystal, and 300 m water resistance. It runs on the 6R54 calibre with a 72-hour power reserve and comes on a stainless steel bracelet. On 23 October 2026 the lowest UK price was £1,700.00 at Beaverbrooks, in stock, with free delivery and 30-day returns. With the voucher code GET50, Beaverbrooks brings it to £1,650.00.
At £1,700 this watch is mid-priced for a men's automatic watch with a 40–44 mm case: 50% of the 1,381 we track from every brand cost less. 94% of the 330 Seiko watches we track cost less than this one. This is the 55th cheapest of the 66 versions of the Prospex we list.
