Seiko Cal. 0740 - 640

The Seiko 0740-640 represents an important milestone in Seiko's 1973 lineup. With its 21mm lug width and 11.3mm profile, it sits comfortably on most wrists. [seikata-wm-e98ed6b5b100]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

11.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1973

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