Seiko Cal. 6133 - 731

Seiko 6133-731

This Spring Drive model from 1967 features a 34mm Hardlex-Coated Steel case. With its 19mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-f03a7cc7ecf0]

Also known as: Monster, Bellmatic

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
34mm
Case Thickness
13.0mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
190m
Dial Color
Black
Jewels
33j
Frequency
21,600 bph
Power Reserve
63 hours
Year
1967

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