Seiko Cal. 6659 - 321

The Seiko 6659-321 represents an important milestone in Seiko's 1967 lineup. Powered by the 6659 caliber with 17j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-73eeb0cd4cce]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1967

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