Seiko Cal. 6631 - 680

The 6631-680 is a sought-after Hand-Winding piece from Seiko's golden era. It features a White dial protected by a Hardlex crystal and offers 160m of water resistance. [seikata-wm-dd256f5040af]

Also known as: Sumo, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

13.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

160m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1972

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