Seiko Cal. 6691 - 556

The Seiko 6691-556 represents an important milestone in Seiko's 1978 lineup. It features a Cream dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-5763567943a3]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

39mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Cream

Jewels

36j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1978

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