Seiko Cal. 6640 - 902

Seiko 6640-902

The 6640-902 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6640 caliber with 20j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-0b524cbe7db7]

Also known as: Monster, Navigator

Specifications

Movement
Automatic
Case Material
PVD Black
Case Width
35mm
Case Thickness
13.8mm
Lug Width
18mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
150m
Dial Color
Silver
Jewels
20j
Frequency
21,600 bph
Power Reserve
48 hours
Year
1990

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