Seiko Cal. 3840 - 445

This Spring Drive model from 1982 features a 42mm Two-Tone case. Powered by the 3840 caliber with 18j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-d8ff8b68aeb0]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

13.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Cream

Jewels

18j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1982

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