Seiko Cal. 3864 - 997

The Seiko 3864-997 represents an important milestone in Seiko's 1980 lineup. The Bidirectional bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-155da66e30cf]

Also known as: Helmet, World Timer

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

11.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1980

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