Seiko Cal. 3865 - 634

The 3865-634 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 110m of water resistance. [seikata-wm-ea836692d6b3]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

11.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1990

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