Seiko Cal. 6688 - 738

The Seiko 6688-738 represents an important milestone in Seiko's 1979 lineup. It features a Navy dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-6b3c91c240d1]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

15.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1979

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