Seiko Cal. 6691 - 637

This Solar model from 1981 features a 36mm PVD Black case. It features a Champagne dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-783d730838d8]

Also known as: Bellmatic

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Champagne

Jewels

26j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1981

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