Seiko Cal. 6644 - 528

The Seiko 6644-528 represents an important milestone in Seiko's 1977 lineup. Powered by the 6644 caliber with 35j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-bba5b405a4ba]

Also known as: Navigator, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

8.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

60m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1977

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