Seiko Cal. 3840 - 631

This Automatic model from 1975 features a 41mm Hardlex-Coated Steel case. It features a Champagne dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-1fb833c665c5]

Also known as: Bellmatic, Crown

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Champagne

Jewels

36j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1975

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