Seiko Cal. 4581 - 821

This Spring Drive model from 1974 features a 41mm Two-Tone case. It features a Burgundy dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-b4ac146deae4]

Also known as: Monster, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Burgundy

Jewels

27j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1974

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