Seiko Cal. 4431 - 553

This Hand-Winding model from 1972 features a 37mm Two-Tone case. It features a Navy dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-151b174dc81e]

Also known as: Sumo, Shogun

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1972

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