Seiko Cal. 6640 - 618

Seiko 6640-618

This Quartz model from 1968 features a 43mm Hardlex-Coated Steel case. Powered by the 6640 caliber with 26j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-ac80e4290e28]

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
10.1mm
Lug Width
18mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
190m
Dial Color
Champagne
Jewels
26j
Frequency
36,000 bph
Power Reserve
37 hours
Year
1968

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