Seiko Cal. 5623 - 312

The Seiko 5623-312 represents an important milestone in Seiko's 1978 lineup. It features a Black dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-5da29e527f7b]

Also known as: Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Black

Jewels

28j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1978

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