Seiko Cal. 6656 - 139

The Seiko 6656-139 represents an important milestone in Seiko's 1972 lineup. Powered by the 6656 caliber with 31j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-0b120399c1a3]

Also known as: Rally, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

14.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1972

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