Seiko Cal. 3840 - 445

Released in 1979, the Cal. 3840 with design code 445 was part of Seiko's domestic market collection. It features a Black dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-22315be05ab6]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

13.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Black

Jewels

30j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1979

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