Seiko Cal. 6656 - 731

The Seiko 6656-731 represents an important milestone in Seiko's 1975 lineup. It features a Silver dial protected by a Acrylic crystal and offers 30m of water resistance. [seikata-wm-03d20a9448d4]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Silver

Jewels

35j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1975

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