Seiko Cal. 3815 - 640

This Automatic model from 1998 features a 37mm Two-Tone case. Powered by the 3815 caliber with 31j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-1d5b38c028d4]

Also known as: Monster

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

13.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1998

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