Seiko Cal. 6231 - 813

The 6231-813 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6231 caliber with 26j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-07d156b50ab8]

Also known as: Turtle, Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

100m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1978

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