Is your SKX
the real deal?
The Seiko SKX007 and SKX009 are legendary discontinued divers that command a massive following on the secondary market. Their popularity has made them a prime target for counterfeits and "franken-watches" (genuine cases fitted with fake dials or movements). Here's how to spot the fakes.
How to authenticate an SKX
7S26 Movement (No Hacking, No Hand-Wind)
The genuine SKX uses the Seiko 7S26 automatic movement, which does not support hacking (second hand stopping) or hand-winding. If you pull the crown out and the second hand stops, or if you can wind the crown in the neutral position, the movement is not a genuine 7S26 and the watch may be a counterfeit or franken-watch.
Case Back Medallion (Tsunami Logo)
The solid steel case back features Seiko's iconic tsunami wave medallion embossed in the center. On genuine SKX watches, the wave design has sharp, well-defined ridges with consistent depth. The case back also displays "7S26-0020" (caliber-case code), the serial number, and "WATER RESISTANT" markings. Counterfeits often have a flat, poorly detailed wave design.
Lumibrite Lume Consistency
Genuine SKX watches use Seiko's proprietary Lumibrite lume, which glows a consistent blue-green color across all hands and indices. The lume application should be even in thickness and coverage. In darkness, all lume plots should glow at roughly the same intensity. Counterfeits often have patchy, uneven lume that glows inconsistently or in the wrong color.
Bezel Insert Alignment
The bezel insert should sit flush within the bezel housing with no gaps or raised edges. The triangle marker at 12 o'clock should align precisely with the 12 o'clock index when the bezel is set to the home position. The minute markings on the bezel insert should be evenly spaced and cleanly printed. Counterfeit inserts often have uneven printing, incorrect font, or poor alignment within the housing.
"SEIKO" Logo on Crown
The crown on a genuine SKX is signed with the "SEIKO" brand name or the "S" logo, engraved or embossed on the crown tip. The crown should screw down smoothly and seat flush against the case when tightened. Counterfeits often have a blank, unsigned crown or one with a poorly stamped logo that wears off easily.
Dial Printing ("DIVER'S 200m")
The genuine SKX dial displays "SEIKO" at 12 o'clock, "AUTOMATIC" below the Seiko logo, the day-date window at 3 o'clock, and "DIVER'S 200m" at the 6 o'clock position. All text should be sharply printed with no bleeding, smudging, or inconsistencies in font weight. The "DIVER'S" text includes an apostrophe -- counterfeits sometimes print "DIVERS" without it.
SKX counterfeit warning signs
Display Case Back (Genuine Has Solid)
The genuine SKX007 and SKX009 have a solid steel case back with the tsunami medallion. They do not have a transparent or display case back. If you can see the movement through the case back, the watch is either a counterfeit or has been modified with an aftermarket case back, which may compromise the 200m water resistance rating.
Wrong Case Back Medallion Design
The tsunami wave medallion on the case back has a specific design with a defined number of wave crests and a particular art style. Counterfeits often use a simplified wave design, wrong proportions, or add extra text that genuine models don't have. Compare the medallion carefully against verified reference photos.
Uneven Lume Application
While Seiko's lume application on the SKX is factory-applied and consistent, counterfeits show obvious signs of hand-applied lume: uneven thickness, lume spilling outside of index boundaries, inconsistent glow intensity between markers, or a yellow-green glow color instead of the genuine blue-green Lumibrite glow.
Misaligned Chapter Ring
The chapter ring (printed minute track inside the crystal) should align with the dial indices. Note: slight chapter ring misalignment is a known quality control issue on some genuine Seiko watches, typically within 1-2 degrees. However, severe misalignment where minute markers are visibly off by several degrees from the hour indices is a strong indicator of a counterfeit or poorly assembled franken-watch.
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Frequently asked questions
What is the difference between the SKX007 and SKX009?
The Seiko SKX007 and SKX009 share the same case, movement (7S26), and 200m diver rating. The only difference is the bezel insert: the SKX007 has an all-black bezel insert, while the SKX009 has a blue-and-red "Pepsi" bezel insert. Both models use the same black dial. The SKX007 was typically sold on a rubber strap, and the SKX009 on a Jubilee bracelet, though both bracelets and straps are interchangeable.
Why was the Seiko SKX discontinued?
Seiko discontinued the SKX007 and SKX009 around 2021, replacing them with the Seiko 5 Sports line (sometimes called the "5KX" by collectors). The new models feature an upgraded 4R36 movement with hacking and hand-winding capabilities that the original 7S26 lacked. However, the new 5KX models are only rated for 100m water resistance instead of the SKX's 200m ISO-rated diver specification, which is why the original SKX remains highly sought after.
What are the specs of the 7S26 movement?
The Seiko 7S26 is a 21-jewel automatic movement that beats at 21,600 vibrations per hour (6 beats per second). It has a power reserve of approximately 41 hours. Notably, the 7S26 does not support hacking (the second hand does not stop when the crown is pulled out) and does not support hand-winding. This means you must shake the watch or wear it to wind it. The lack of hacking and hand-winding is actually a useful authentication point, as counterfeits sometimes use movements that do hack or hand-wind.