The Seiko SKX watch line, introduced in 1996, encompasses a wide range of models characterized by the use of the automatic 7S26 caliber.
The series features watches designed for various purposes, ranging from the classic Seiko 5 to professional divers with a water resistance of 200 meters, and extending to sports models with 100 meters water resistance.
This guide focuses on certified diver watches, namely those in the SKX line that bear the “Diver’s” inscription on the dial and/or case back.
All other models, including sports versions with a 100-meter water resistance, are covered in the guide to all models of the Seiko SKX line.
Diver’s 200 m of the SKX line
In 1996 Seiko introduces the automatic 7S26 caliber with the SKX series, starting from the 7S26-0010, presented in various color combinations.
The relatively compact case, with its 38 mm diameter, places it in the mid-size diver category.
SKX001
Case code: 7S26-0010
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 38 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX003
Case code: 7S26-0010
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 38 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX005
Case code: 7S26-0010
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 38 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX006
Case code: 7S26-0010
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 38 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The following three models are considered the most popular of the entire SKX series, as well as the direct successors of the 7002-700x (SDS001, SDS003, and SDS005), going through the transitional 7002-7039 (SDS101 and SDS105), from which they inherit the Slim Turtle design.
A unique feature is the shape of the indices, which take on the typical style of the previous quartz Slim Turtles.
The sales success of the SKX007, SKX009, and SKX011 was such that production continued for more than 20 years since their release.
SKX007
Case code: 7S26-0020
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX009
Case code: 7S26-0020
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX011
Case code: 7S26-0020
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The three subsequent references take up the color configurations of the SKX007, SKX009, and SKX011, but make use of a 38 mm case similar to the 7S26-0010 of the previous SKX001, SKX003, SKX005, and SKX006 models.
While the SKX013 model was produced in large numbers and for many years, the Pepsi (SKX015) and orange (SKX017) versions were produced in limited quantities, making the originals hard to find.
SKX013
Case code: 7S26-0030
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 38 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX015
Case code: 7S26-0030
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 38 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX017
Case code: 7S26-0030
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 38
mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
Followed by the 7S26-7020 (SKX169 and SKX171), which takes the place of the 7002-7020 (SDS099).
SKX169
Case code: 7S26-7020
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX171
Case code: 7S26-7020, 7S26-7029
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The SKX173, intended for the North American market, is very similar to the SKX007 but features the indices always used on automatic Slim Turtles, and also differs in the position of the dot on the seconds hand.
SKX173
Case code: 7S26-0029, 7S26-0028
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The SKX175 appears virtually identical to the SKX009, but it is a reference for the North American market, distinguishable by the “mov’t Malaysia” or “mov’t Singapore” writing at the bottom of the dial.
SKX175
Case code: 7S26-0029
Caliber: Automatic 7S26
Year: 1996
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
In 1998 Seiko introduces two other divers from the SKX line that are reminiscent of the SKX007 and SKX009 styles but with some variations such as the shape of the indices.
SKX399
Case code: 7S26-0020
Caliber: Automatic 7S26
Year: 1998
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX401
Case code: 7S26-0020
Caliber: Automatic 7S26
Year: 1998
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The SKX403 and SKX405, introduced in 1999, are characterized by a titanium case.
SKX403
Case code: 7S26-0160
Caliber: Automatic 7S26
Year: 1999
Titanium case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX405
Case code: 7S26-0160
Caliber: Automatic 7S26
Year: 1998
Titanium case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
In 1999 Seiko introduces two more SKX divers with titanium cases.
SKX421
Case code: 7S26-0150
Caliber: Automatic 7S26
Year: 1999
Titanium case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX423
Case code: 7S26-0150
Caliber: Automatic 7S26
Year: 1999
Titanium case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
In 2000, the Seiko Monster models debut in the SKX line, with a black variant (SKX779) and an orange variant (SKX881).
SKX779 “Black Monster”
Case code: 7S26-0350, 7S26-0351
Caliber: Automatic 7S26
Year: 2000
Stainless steel case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKX781 “Orange Monster”
Case code: 7S26-0350, 7S26-0351
Caliber: Automatic 7S26
Year: 2000
Stainless steel case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
In 2002, the SKXA33 reference is introduced, with a unique design characterized especially by the bezel and integrated bracelet.
SKXA33
Case code: 7S26-01C0, 7S26-01C1
Caliber: Automatic 7S26
Year: 2002
Stainless steel case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
Also in 2002, the SKXA35, nicknamed “Bumblebee” by enthusiasts, was launched on the North American market.
SKXA35 “Bumblebee”
Case code: 7S26-0029, 7S26-0028
Caliber: Automatic 7S26
Year: 2002
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The following references are variants of the first-generation black and orange Monsters, intended for the North American market.
SKXA37 “Orange Monster”
Case code: 7S26-0351
Caliber: Automatic 7S26
Year: 2002
Stainless steel case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKXA43 “Black Monster”
Case code: 7S26-0350, 7S26-0351
Caliber: Automatic 7S26
Year: 2002
Stainless steel case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKXA45 “Orange Monster”
Case code: 7S26-0350
Caliber: Automatic 7S26
Year: 2002
Stainless steel case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
In 2004 Seiko introduces the divers now known as “Knight”, in three different colors: white, black, and orange.
SKXA47 “White Knight”
Case code: 7S26-01X0
Caliber: Automatic 7S26
Year: 2004
Stainless steel case 42 mm in diameter and 13 mm thick, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKXA49 “Black Knight”
Case code: 7S26-01X0
Caliber: Automatic 7S26
Year: 2004
Stainless steel case 42 mm in diameter and 13 mm thick, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKXA51 “Orange Knight”
Case code: 7S26-01X0
Caliber: Automatic 7S26
Year: 2004
Stainless steel case 42 mm in diameter and 13 mm thick, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The following two models, SKXA53 and SKXA55, are nicknamed “Bullet” by fans for their bullet-shaped indices.
SKXA53 “Black Bullet”
Case code: 7S26-02K0
Caliber: Automatic 7S26
Stainless steel case 41 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
SKXA55 “Orange Bullet”
Case code: 7S26-02K0
Caliber: Automatic 7S26
Stainless steel case 41 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The SKXA61 reference is the North American market version of the SKXA51.
SKXA61 “Orange Knight”
Case code: 7S26-01X0
Caliber: Automatic 7S26
Stainless steel case 42 mm in diameter and 13 mm thick, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The SKXA63 reference, for the North American market, revisits the shapes of the SKX169 and SKX171 in a new color configuration.
SKXA63
Case code: 7S26-7020
Caliber: Automatic 7S26
Stainless steel case 43 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
The last diver in the SKX line, with reference SKXA65 (7S26-04N0), is a limited edition of 2999 pieces exclusive to Thailand, featuring a curious design with elements borrowed from other models, such as the Seiko Sumo style hands.
SKXA65
Case code: 7S26-04N0
Caliber: Automatic 7S26
Limited edition of 2999 pieces for Thailand.
Stainless steel case 42 mm in diameter, Hardlex crystal, screw-down crown, 21 jewels, 41-hour power reserve, 21,600 vibrations/hour.
Reference Table
Ref. | Other Ref. | Nickname | Code | Caliber | Limited |
---|---|---|---|---|---|
SKX001 | SKX001J1, SKX001J, SKX001K1, SKX001K | 7S26-0010 | 7S26 | No | |
SKX003 | SKX003J1, SKX003J, SKX003K1, SKX003K, SKX003P1, SKX003P | 7S26-0010 | 7S26 | No | |
SKX005 | SKX005J1, SKX005J, SKX005K1, SKX005K | 7S26-0010 | 7S26 | No | |
SKX006 | SKX006J1, SKX006J, SKX006K1, SKX006K, SKX006H1, SKX006H | 7S26-0010 | 7S26 | No | |
SKX007 | SKX007J1, SKX007J2, SKX007J, SKX007K1, SKX007K2, SKX007K | 7S26-0020 | 7S26 | No | |
SKX009 | SKX009J1, SKX009J2, SKX009J, SKX009K1, SKX009K2, SKX009K | 7S26-0020 | 7S26 | No | |
SKX011 | SKX011J1, SKX011J2, SKX011J, SKX011K1, SKX011K2, SKX011K | 7S26-0020 | 7S26 | No | |
SKX013 | SKX013J1, SKX013J2, SKX013J, SKX013K1, SKX013K2, SKX013K | 7S26-0030 | 7S26 | No | |
SKX015 | SKX015J1, SKX015J2, SKX015J, SKX015K1, SKX015K2, SKX015K | 7S26-0030 | 7S26 | No | |
SKX017 | SKX017J1, SKX017J2, SKX017J, SKX017K1, SKX017K2, SKX017K | 7S26-0030 | 7S26 | No | |
SKX169 | SKX169J1, SKX169J2, SKX169J, SKX169K1, SKX169K2, SKX169K | 7S26-7020 | 7S26 | No | |
SKX171 | SKX171J1, SKX171J2, SKX171J, SKX171K1, SKX171K2, SKX171K, SKX171P1, SKX171P9, SKX171P | 7S26-7020, 7S26-7029 | 7S26 | No | |
SKX173 | SKX173P1, SKX173P9, SKX173P | 7S26-0029 7S26-0028 | 7S26 | No | |
SKX175 | SKX175P1, SKX175P9, SKX175P | 7S26-0029 | 7S26 | No | |
SKX399 | SKX399K1, SKX399K | 7S26-0020 | 7S26 | No | |
SKX401 | SKX401K1, SKX401K | 7S26-0020 | 7S26 | No | |
SKX403 | SKX403J1, SKX403J2, SKX403J, SKX403K1, SKX403K2, SKX403K | 7S26-0160 | 7S26 | No | |
SKX405 | SKX405K1, SKX405K | 7S26-0160 | 7S26 | No | |
SKX421 | SKX421J1, SKX421J2, SKX421J, SKX421K1, SKX421K2, SKX421K | 7S26-0150 | 7S26 | No | |
SKX423 | SKX423K1, SKX423K | 7S26-0150 | 7S26 | No | |
SKX779 | SKX779J1, SKX779J2, SKX779J3, SKX779J, SKX779K1, SKX779K2, SKX779K3, SKX779KC, SKX779KG, SKX779K, SKX779P9, SKX779P | Black Monster | 7S26-0350, 7S26-0351 | 7S26 | No |
SKX781 | SKX781J1, SKX781J2, SKX781J3, SKX781J, SKX781K1, SKX781K2, SKX781K3, SKX781KC, SKX781KG, SKX781K, SKX781P9, SKX781P | Orange Monster | 7S26-0350, 7S26-0351 | 7S26 | No |
SKXA33 | SKXA33K1, SKXA33K, SKXA33P9, SKXA33P | 7S26-01C0, 7S26-01C1 | 7S26 | No | |
SKXA35 | SKXA35P9, SKXA35P | Bumblebee | 7S26-0029 7S26-0028 | 7S26 | No |
SKXA37 | SKXA37P9, SKXA37P | 7S26-0351 | 7S26 | No | |
SKXA43 | SKXA43P9, SKXA43P | Black Monster | 7S26-0350 7S26-0351 | 7S26 | No |
SKXA45 | SKXA45P9, SKXA45P | Orange Monster | 7S26-0351 | 7S26 | No |
SKXA47 | SKXA47J1, SKXA47J, SKXA47K1, SKXA47K | White Knight | 7S26-01X0 | 7S26 | No |
SKXA49 | SKXA49J1, SKXA49J, SKXA49K1, SKXA49K2, SKXA49K3, SKXA49K | Black Knight | 7S26-01X0 | 7S26 | No |
SKXA51 | SKXA51K1, SKXA51K | Orange Knight | 7S26-01X0 | 7S26 | No |
SKXA53 | SKXA53J1, SKXA53J, SKXA53K1, SKXA53K2, SKXA53K | Black Bullet | 7S26-02K0 | 7S26 | No |
SKXA55 | SKXA55J1, SKXA55J, SKXA55K1, SKXA55K2, SKXA55K | Orange Bullet | 7S26-02K0 | 7S26 | No |
SKXA61 | SKXA61P1, SKXA61P9, SKXA61P | Orange Knight | 7S26-01X0 | 7S26 | No |
SKXA63 | SKXA63P1, SKXA63P9, SKXA63P | 7S26-7020 | 7S26 | No | |
SKXA65 | SKXA65K1, SKXA65K | 7S26-04N0 | 7S26 | 2999 |
Caliber 7S26 Specifications
Type | Automatic |
Power reserve | 41 hours |
Vibrations/hour | 21,600 |
Jewels | 21 |
Lift Angle | 53° |
Manual winding | No |
Hack feature | No |