Seiko Cal. 0731 - 978

The Seiko 0731-978 represents an important milestone in Seiko's 1971 lineup. It features a Silver dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-0afb55f08b4c]

Also known as: Turtle, Sumo

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1971

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