The Seiko SRP309, the second-generation "Orange Monster," is a professional-grade automatic dive watch released in 2012. It is best known for its "Shark Tooth" dial indices and for upgrading the line with the 4R36 movement, which added hand-winding and hacking (stop-seconds) capabilities.
Specifications
SKU
02202026133726
Item
Wristwatch
Brand
Seiko
Model
Orange Monster 2nd Gen
Reference
SRP309
Year
Dial Color
Orange
Case Material
Steel
Movement
Automatic
Caliber
4R36A
Country
Japan
Gender
Men's
Jewels
Grade
Band Material
Functions
Type
Department
Balance
Condition
Overall Condition
Fair, overall condition
Case
Shows scratches. Has patina.
Crystal
Crystal Condition
Dial
Crown
Shows desk marks.
Crown Condition
Hands
Hands Condition
Band
Shows scratches and scuffings. Has patina. The band has some stretch between the links.
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 3 seconds a day, Amplitude 236, Beat Error 0.3
Additional Notes
Measurements
Diameter
42.5mm
Dial Diameter
Width
Length
Height
Thickness
13mm
Lug Width
20.2mm
Lug to Lug
47.5mm
Bracelet Size
7in
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.