Seiko Cal. 6671 - 640

The 6671-640 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6671 caliber with 25j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-6549eede4a9a]

Also known as: Sumo, UFO

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Champagne

Jewels

25j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1978

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