Seiko Cal. 6640 - 805

The 6640-805 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6640 caliber with 20j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-9adb72dbbb32]

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

15.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Cream

Jewels

20j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1982

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