Seiko Cal. 6688 - 711

Seiko 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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seikata-wm-37b25c788467