Seiko Cal. 3840 - 707

The Seiko 3840-707 represents an important milestone in Seiko's 1981 lineup. Powered by the 3840 caliber with 18j jewels beating at 36,000 bph, it delivers a 67 hours power reserve. [seikata-wm-d0e3a64b558e]

Also known as: Sea Horse, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1981

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