When it first arrived on the watch scene in the early aughts, Seiko’s Prospex SKX779 dive watch drove a wedge through the middle of the watch enthusiast space. Some found its bizarre, chunky appearance downright disgusting, while others fell madly in love with its quirks.
For better or worse, the watch — which earned the moniker “Monster” — became a mainstay of Seiko’s dive watch category. Now, this beast turns another unique page in its long history with the release of the exclusive Seiko x Beams Prospex SKX781.

The beast from 109 fathoms
Thankfully, the chunky stainless steel case and matching thick link band — two elements that earned this Seiko Prospex diver the nickname “Monster” — remain in this new version.
In fact, much of what makes the SKX781 popular among fans and collectors has stayed intact. That includes its rotating dive timer bezel, Lumibrite-coated hands and dial markers, 3 o’clock day-date window, 4 o’clock crown and even its hardlex crystal.
Most critically, it is still powered by the same reliable, time-tested, serviceable 4R36 automatic mechanical movement. This is also why the watch is still the same beefy 42.5mm size.