Seiko Cal. 6657 - 487

The Seiko 6657-487 represents an important milestone in Seiko's 1974 lineup. Powered by the 6657 caliber with 36j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-811edd425677]

Also known as: Sumo, Crown

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

11.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1974

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