Seiko Cal. 3840 - 690

Released in 1975, the Cal. 3840 with design code 690 was part of Seiko's domestic market collection. It features a Black dial protected by a Sapphire crystal and offers 160m of water resistance. [seikata-wm-a9b391cd04cd]

Also known as: Samurai

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1975

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