Seiko Cal. 5230 - 731

The Seiko 5230-731 represents an important milestone in Seiko's 1977 lineup. It features a White dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-61c69ce14e7f]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

White

Jewels

29j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1977

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