Seiko Cal. 4431 - 780

This Spring Drive model from 1986 features a 34mm Two-Tone case. Powered by the 4431 caliber with 36j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-30d296904c95]

Also known as: Tuna, Emperor

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

60m

Dial Color

Silver

Jewels

36j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1986

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