Seiko Cal. 6631 - 577

The 6631-577 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6631 caliber with 32j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-26a02b84eed9]

Also known as: Samurai, Bullhead

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1994

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