Seiko Cal. 5638 - 715

The Seiko 5638-715 represents an important milestone in Seiko's 1978 lineup. Powered by the 5638 caliber with 26j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-11f239365450]

Also known as: Golden Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

White

Jewels

26j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1978

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