Seiko Cal. 6644 - 771

The Seiko 6644-771 represents an important milestone in Seiko's 1965 lineup. Powered by the 6644 caliber with 30j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-ff42146f23e6]

Also known as: Turtle, Emperor

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

14.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

30j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1965

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