Seiko Cal. 5671 - 617

The Seiko 5671-617 represents an important milestone in Seiko's 1971 lineup. With its 20mm lug width and 12.9mm profile, it sits comfortably on most wrists. [seikata-wm-4caf41e87c67]

Also known as: Sumo, UFO

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

12.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Champagne

Jewels

18j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1971

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