The Seiko 6309-7040 is an iconic, vintage automatic dive watch, popular among collectors for its distinctive cushion-shaped "Turtle" case and robust design. It was produced from 1976 to 1988 and gained a reputation for durability, even seeing use with US Navy SEAL teams.
Specifications
SKU
02162026231206
Item
Wristwatch
Brand
Seiko
Model
Turtle
Reference
6309-7040
Year
Dial Color
Black
Case Material
Stainless Steel
Movement
Automatic
Caliber
6309
Country
Japan
Gender
Men's
Jewels
17
Grade
Band Material
Functions
Type
Department
Balance
Condition
Overall Condition
Poor, overall condition
Case
Shows scratches and scuffings.
Crystal
Shows scratches and scuffings.
Crystal Condition
Dial
Has faded lume.
Crown
Shows desk marks.
Crown Condition
Hands
Hands Condition
Band
The band is not original.
Function
Running, but may be in need of service. This means, it can run unreliably, start or stop and timekeeping is not guaranteed
Winding
Timing Data
Losing 133 seconds a day, amplitude 228, beat error 9.0ms.
Additional Notes
Measurements
Diameter
44mm
Dial Diameter
Width
Length
Height
Thickness
13mm
Lug Width
22mm
Lug to Lug
45mm
Bracelet Size
Inside Diameter
Outside Diameter
Inside Width
Inside Length
Outside Length
Outside Width
Band Width
Band Clasp Width
Band End Link Width
Band Length
Box Length
Box Width
Size
Standardized Size
About the Brand
Seiko: A beloved brand among collectors, Seiko has long been known for offering exceptional watches at accessible prices. Founded in 1881, the Japanese brand earned worldwide recognition for its divers, sports chronographs, and industry-leading quartz technology. With a lineup that includes historically significant and technically innovative pieces, Seiko remains one of the most widely collected and respected watch brands across all price points.