The Seiko 8306-1000 is a classic mid-1960s automatic wristwatch powered by Seiko's respected 30-jewel Caliber 8306A movement with day and date display. Combining reliable Japanese engineering with timeless vintage styling, it remains a favorite among collectors of early Seiko automatic watches.
Specifications
SKU
07102026134236
Item
Wristwatch
Brand
Seiko
Model
Sea Lion M77
Reference
8306-1000
Year
1966
Dial Color
Grey
Indices
Baton Indexes
Case Material
Stainless Steel
Movement
Automatic
Caliber
8306A
Country
Japan
Gender
Men's
Jewels
30
Band Material
Leather: Black Crocodile
Department
Men
Condition
Overall Condition
Fair, overall condition
Case
Shows scratches.
Crystal
Shows hairline scratches.
Function
Running, but may be in need of service. This means, it can run unreliably, start or stop and timekeeping is not guaranteed
Timing Data
Minus 65 Seconds/day, 246 Amp, 1.2 BE
Complications
Day-Date.
Measurements
Diameter
37mm
Thickness
11mm
Lug Width
20mm
Lug to Lug
41mm
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.