Seiko Cal. 6640 - 990

Seiko 6640-990

This Solar model from 1997 features a 42mm Hardlex-Coated Steel case. Powered by the 6640 caliber with 27j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-ab2bac785ecb]

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
42mm
Case Thickness
13.0mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
120m
Dial Color
Green
Jewels
27j
Frequency
21,600 bph
Power Reserve
64 hours
Year
1997

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