Seiko Cal. 3815 - 318

The Seiko 3815-318 represents an important milestone in Seiko's 1986 lineup. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-2d08bf8239ee]

Also known as: Turtle, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

45mm

Case Thickness

9.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1986

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