Seiko Cal. 0731 - 691

Seiko 0731-691

This Automatic model from 1971 features a 35mm Gold-Plated case. Powered by the 0731 caliber with 26j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-7603d4f037bb]

Also known as: Bellmatic

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
35mm
Case Thickness
8.5mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
200m
Dial Color
Green
Jewels
26j
Frequency
36,000 bph
Power Reserve
65 hours
Year
1971

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seikata-wm-7603d4f037bb