Seiko Cal. 3898 - 640

Released in 1972, the Cal. 3898 with design code 640 was part of Seiko's domestic market collection. The Inner Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-40d0abed8aaf]

Also known as: Samurai, Shogun

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

8.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

24j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1972

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