Seiko Cal. 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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