Seiko Cal. 6657 - 411

The Seiko 6657-411 represents an important milestone in Seiko's 1972 lineup. Powered by the 6657 caliber with 35j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-5a03d8cd1479]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

35mm

Case Thickness

8.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1972

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