Seiko Cal. 6634 - 678

The 6634-678 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6634 caliber with 27j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-0864ab876490]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1991

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