Seiko Cal. 6631 - 426

The 6631-426 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Black dial protected by a Mineral crystal and offers 130m of water resistance. [seikata-wm-4fa2ce15b96e]

Also known as: Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1970

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