Seiko Cal. 3840 - 391

The Seiko 3840-391 represents an important milestone in Seiko's 1970 lineup. It features a Navy dial protected by a Sapphire crystal and offers 80m of water resistance. [seikata-wm-4985497df530]

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

12.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

80m

Dial Color

Navy

Jewels

27j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1970

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