Seiko Cal. 3898 - 637

The 3898-637 is a sought-after Hand-Winding piece from Seiko's golden era. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-fb4fe2a7e040]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

12.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Cream

Jewels

25j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1982

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