Seiko Cal. 6657 - 791

The Seiko 6657-791 represents an important milestone in Seiko's 1968 lineup. Powered by the 6657 caliber with 35j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-e8ca6866d6ab]

Also known as: UFO

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

35j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1968

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