Seiko Cal. 5665 - 721

The Seiko 5665-721 represents an important milestone in Seiko's 1976 lineup. Powered by the 5665 caliber with 29j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-e6962ba80a2b]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

45mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Burgundy

Jewels

29j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1976

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