Seiko Cal. 5637 - 670

The Seiko 5637-670 represents an important milestone in Seiko's 1981 lineup. It features a Black dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-2e6f9ae422f4]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

41mm

Case Thickness

13.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Black

Jewels

23j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1981

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