Seiko Cal. 5639 - 761

The Seiko 5639-761 represents an important milestone in Seiko's 1993 lineup. With its 21mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-13d45ae1eb06]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1993

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