Seiko Cal. 5657 - 738

The Seiko 5657-738 represents an important milestone in Seiko's 1973 lineup. With its 18mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-3f7711098e30]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

46mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1973

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