Seiko Cal. 6645 - 303

The Seiko 6645-303 represents an important milestone in Seiko's 1977 lineup. Powered by the 6645 caliber with 29j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-434e83776f8b]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

50m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1977

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