Seiko Cal. 4431 - 877

This Spring Drive model from 1988 features a 40mm Titanium case. Powered by the 4431 caliber with 24j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-3a1efc5208b4]

Also known as: Sumo, Panda

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

13.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Silver

Jewels

24j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1988

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