Seiko Cal. 3840 - 840

This Spring Drive model from 1966 features a 35mm Two-Tone case. Powered by the 3840 caliber with 19j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-8c49988e4f5f]

Also known as: Monster, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

8.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Green

Jewels

19j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1966

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