Seiko Cal. 4537 - 731

The Seiko 4537-731 represents an important milestone in Seiko's 1972 lineup. With its 18mm lug width and 8.0mm profile, it sits comfortably on most wrists. [seikata-wm-7398db96437d]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

44mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1972

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