Seiko Cal. 6138 - 670

The Seiko 6138-670 represents an important milestone in Seiko's 1971 lineup. Powered by the 6138 caliber with 18j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-05358c5bbc62]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1971

Related Models

• Seiko 7114-684
• Seiko 7169-829
• Seiko 5234-866
• Seiko 6123-206
• Seiko 7058-286
• Seiko 3889-824
• Seiko 7126-965
• Seiko 6698-117
• Seiko 5227-868
• Seiko 5631-951
• Seiko 7066-551
• Seiko 6121-876