There are many vintage Seiko divers popular with collectors, and the legendary 7S26 – like the 1999 Seiko "62MAS" SKX031 automatic diver here, on original Seiko jubilee bracelet oyster bracelet – is one of these. 
 
Atypical about this watch?  It's been extensively modded to resemble one of Seiko's legendary 6217-8000/1 "62MAS" divers, the Japanese company's first professional dive watch.  Why go through all this trouble?  Per Fratello, "The Seiko 62MAS (autoMAtic Selfdater) is the first professional series diver from Seiko: period.  It is the “ur-diver”, the alpha, the patriarch…you get my point.  All professional divers from Seiko owe at least some of their design to this piece and as you can see in the pictures, things like bezel font, dial color, and markers to some degree still bear a familial resemblance in today’s pieces.  If you are a Seiko vintage diver collector and you do not own a 62MAS, I’d bet 10:1 that it’s on your list."
 
With good reason, the SKX continues to have a tremendous cult following, despite Seiko's odd decision to discountinue these legendary divers in 2019 - the design is simple and robust, with strong evidence of Seiko divers that came before it, namely the instantly recognizable Seiko 7002 automatic, 7548 quartz, and even the famous 6309 diver.  Hollywood has noticed - the SKX has appeared in multiple films, to include on the wrist of Robert Redford in his action drama sailing film, "All is Lost."
 
Military forces the world over have long took note of the SKX line, with its reliable automatic movement – during its heyday, it was also popular with various armed forces for this same reason, despite the widely held (false) assumption that military personnel only wear military watches issued to them.
 
USMIL General Norman "Stormin' Norman" Schwarzkopf wore the quartz variant, the Seiko 7548, nearly identical to the SKX, when he routed and then evicted Iraqi forces from Kuwait during Operation Desert Storm, aka the 1991 Gulf War.  He would later write, “I always wore two watches during the [Gulf] war.  The one on my left arm was set on Saudi Arabian time and the Seiko on my right arm was set on Eastern Standard Time.  That way I could quickly glance at my watches and instantly know the time in both Saudi Arabia and Washington, D.C."
 
Seiko’s 7S26 automatic movement was a logical step in its mechanical movement line, and debuted in 1996 to replace the 7002 in Seiko’s popular dive watch line.  This 7S26 incorporates quickset day and date displays, and automatic bi-directional winding via Seiko’s patented Magic Lever system, and runs at 21,600 beats per hour.
 
This Seiko diver comes on original jubilee bracelet, and with nylon strap, rugged travel case, and springbar tool.