Seiko Cal. 6642 - 728

Seiko 6642-728

This Quartz model from 1971 features a 37mm Two-Tone case. Powered by the 6642 caliber with 34j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-50a0ccfbb360]

Also known as: Helmet

Specifications

Movement
Quartz
Case Material
Two-Tone
Case Width
37mm
Case Thickness
14.4mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
130m
Dial Color
Burgundy
Jewels
34j
Frequency
21,600 bph
Power Reserve
57 hours
Year
1971

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