Seiko Cal. 5646 - 378

The Seiko 5646-378 represents an important milestone in Seiko's 1967 lineup. With its 22mm lug width and 12.0mm profile, it sits comfortably on most wrists. [seikata-wm-7dad56ccf20e]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

12.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1967

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