Seiko Cal. 6688 - 711

This Spring Drive model from 1975 features a 37mm PVD Black case. With its 18mm lug width and 11.4mm profile, it sits comfortably on most wrists. [seikata-wm-37b25c788467]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

170m

Dial Color

Green

Jewels

30j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1975

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