Seiko Cal. 6644 - 370

The Seiko 6644-370 represents an important milestone in Seiko's 1980 lineup. Powered by the 6644 caliber with 31j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-93f7e1490c05]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

45mm

Case Thickness

9.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1980

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