Seiko Cal. 5640 - 396

The 5640-396 is a sought-after Automatic piece from Seiko's golden era. With its 18mm lug width and 15.8mm profile, it sits comfortably on most wrists. [seikata-wm-a0b1acb30cd5]

Also known as: UFO, Baby Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

15.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Black

Jewels

34j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1993

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