Seiko Cal. 3817 - 707

The 3817-707 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-9c72d77f2238]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

45mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Green

Jewels

30j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1988

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