Seiko Cal. 5661 - 729

Seiko 5661-729

This Quartz model from 1969 features a 44mm Hardlex-Coated Steel case. Powered by the 5661 caliber with 31j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-2b6f8c8d0ce1]

Also known as: Sumo, Helmet

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
44mm
Case Thickness
9.3mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
60m
Dial Color
Green
Jewels
31j
Frequency
21,600 bph
Power Reserve
57 hours
Year
1969

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