Seiko Cal. 3831 - 815

The Seiko 3831-815 represents an important milestone in Seiko's 1970 lineup. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-f25abcb9c71a]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

40mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1970

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