Seiko Cal. 3870 - 331

This Hand-Winding model from 1989 features a 40mm Two-Tone case. Powered by the 3870 caliber with 21j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-174ee7a80825]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1989

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