Seiko Cal. 6131 - 287

This Hand-Winding model from 1974 features a 42mm Stainless Steel case. It features a Black dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-55bbaa48612a]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Black

Jewels

18j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1974

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