Seiko Cal. 6645 - 674

The Seiko 6645-674 represents an important milestone in Seiko's 1975 lineup. Powered by the 6645 caliber with 18j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-70e5ad2bbbb4]

Also known as: Turtle, Helmet

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Black

Jewels

18j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1975

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