Seiko Cal. 6620 - 744

The Seiko 6620-744 represents an important milestone in Seiko's 1977 lineup. Powered by the 6620 caliber with 30j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-d08de6ce927e]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

13.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Navy

Jewels

30j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1977

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