Seiko Prospex Divers Gmt 'Dark Depths' 42mm Mens Watch - 1968 Modern Re-interpretation
This is a modern interpretation of Seiko's landmark 1968 hi-beat diving watch, updated with contemporary mechanics. The 42mm stainless steel case houses the newly developed Calibre 6R54 automatic movement, marking Seiko's first mechanical GMT complication in a diving watch. The movement operates at 21,600 vibrations per hour with a three-day power reserve, includes manual winding capability, and features magnetic resistance to 4,800 A/m. The dial retains classic proportions with applied indices and luminous hands, complemented by a discreet 24-hour scale on the rehaut for GMT functionality. The GMT hand adjusts independently in one-hour increments.
The watch is rated to 200 metres and holds ISO 6425 diver certification, meeting rigorous standards for professional use. The bracelet features a machined three-fold clasp with a divers' extension piece, allowing comfortable wear over a wetsuit. The case incorporates Seiko's Diashock shock protection system, and the movement carries a daily accuracy of +25 to -15 seconds.
The Seiko Prospex SPB383J1 is listed on WatchShopper as a men's 42 mm stainless steel automatic GMT watch with a black dial, a date display, sapphire crystal, and 200 m water resistance. It runs on the 6R54 calibre with a 72-hour power reserve and comes on a stainless steel bracelet. On 22 October 2026 the lowest UK price was £1,400.00 at Beaverbrooks, in stock, with free delivery and 30-day returns. That is above its 188-day tracked average of £1,166.67. With the voucher code GET50, Beaverbrooks brings it to £1,350.00.
WatchShopper has tracked the Seiko Prospex Divers Gmt 'Dark Depths' 42mm Mens Watch - 1968 Modern Re-interpretation across 2 UK retailers for 188 days. In that time the lowest recorded price was £700.00 at Goldsmiths on 16 June 2026, and the highest was £1,400.00 at Goldsmiths. The average tracked price is £1,166.67. At £1,400.00, the current best price is above its tracked average.
| Lowest tracked price | £700.00 |
|---|---|
| Highest tracked price | £1,400.00 |
| Average tracked price | £1,166.67 |
| Current best price | £1,400.00 |
| Tracking since | 16 April 2026 |
At £1,400 this watch is mid-priced for a men's automatic watch with a 40–44 mm case: 48% of the 1,381 we track from every brand cost less. 93% of the 330 Seiko watches we track cost less than this one. This is the 51st cheapest of the 65 versions of the Prospex we list.
