Seiko Cal. 0731 - 716

The Seiko 0731-716 represents an important milestone in Seiko's 1975 lineup. The Coin-Edge bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-cf475204a4bb]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Cream

Jewels

20j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1975

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