Seiko Cal. 6647 - 971

The Seiko 6647-971 represents an important milestone in Seiko's 1966 lineup. With its 18mm lug width and 12.2mm profile, it sits comfortably on most wrists. [seikata-wm-1cf2d670a291]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Burgundy

Jewels

28j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1966

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