Seiko Cal. 5610 - 403

This Spring Drive model from 1965 features a 38mm Stainless Steel case. With its 18mm lug width and 8.0mm profile, it sits comfortably on most wrists. [seikata-wm-55762b7ac0d2]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

8.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Green

Jewels

26j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1965

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